Document And Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Quarterly Financial Data (UNAUDITED) (in millions, except per share data) QuarterlyFinancialInformationTextBlock Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Entity Filer Category Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Balance Sheets [Abstract] ASSETS Cash And Cash Equivalents At Carrying Value End of period Beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Accounts Receivable, Net, Current Receivables, net of allowance of $4.8 and $4.5, respectively Total Receivables, net of allowance Prepaid expenses Prepaid expenses Prepaid expenses (including $0.2 and $0 to founding members, respectively) Prepaid Expense, Current, Total Purchase of movie tickets and concession products (included in Prepaid expenses) Prepaid administrative fees to managing member. Prepaid Administrative Fees To Managing Members Prepaid administration fees to managing member Prepaid management fees to managing member Total current assets Total current assets NON-CURRENT ASSETS: PROPERTY AND EQUIPMENT, net of accum. deprec. of $44.1 and $39.3 million, respectively Net book value Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net of accumulated depreciation of $65.5 and $63.1, respectively Property, Plant and Equipment, Net, Total Total property and equipment Finite-Lived Intangible Assets, Net Integration payments (included in Intangible assets) Total intangible assets, net, ending balance Total intangible assets, net, beginning balance Intangible assets, net of accumulated amortization of $35.6 and $32.5, respectively Finite-Lived Intangible Assets, Net, Total Intangible assets, net of accumulated amortization Deferred Finance Costs, Noncurrent, Net Debt issuance costs, net of accumulated amortization of $12.8 and $12.2, respectively Deferred Finance Costs, Noncurrent, Net, Total Cost Method Investments Other investment Cost method investments Other long-term assets Other non-current assets Other Assets, Noncurrent, Total Assets, Noncurrent Total non-current assets Assets, Total TOTAL ASSETS LIABILITIES AND MEMBERS' EQUITY/(DEFICIT) Amounts due to founding members Amounts due to founding members Amounts due to founding members Consolidated Integration payments due Current amounts due to managing members. Current Amounts Due To Managing Members Amounts due to managing member Amounts due to managing member Accrued expenses Accrued expenses Total accrued expenses Accrued payroll and related expenses Accrued payroll and related expenses Employee-related Liabilities, Current, Total Accounts payable Accounts payable (including $0.6 and $0.9 to related party affiliates, respectively) Accounts Payable, Current, Total Deferred revenue Deferred revenue Deferred Revenue, Current, Total Total current liabilities Total current liabilities Total current liabilities NON-CURRENT LIABILITIES: Long-term Debt, Excluding Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities, Total Debt obligation Liabilities, Noncurrent Total other liabilities Total non-current liabilities Total liabilities Total liabilities Commitments and Contingencies, COMMITMENTS AND CONTINGENCIES (NOTE 5) COMMITMENTS AND CONTINGENCIES (NOTE 12) Total NCM, Inc. stockholders' equity/(deficit) Total NCM, Inc. stockholders' equity/(deficit) Ending balance Beginning balance MEMBERS'EQUITY/(DEFICIT) (including accumulated other comprehensive loss of $19.4 and $21.9 million, respectively) Total NCM, Inc. stockholders' equity/(deficit) MEMBERS' EQUITY/(DEFICIT) (including accumulated other comprehensive loss of $56.9 and $58.3 million, respectively) TOTAL TOTAL TOTAL LIABILITIES AND EQUITY Related Party Transactions, by Related Party [Axis] Related Party [Domain] Related Party [Domain] Management [Member] Founding Members [Member] Revenue And Expenses By Classification [Axis]. Revenue And Expenses By Classification [Axis] Revenue And Expenses By Classification [Domain] Revenue And Expenses By Classification [Domain] Revenue And Expenses By Classification [Domain] Purchase Of Movie Tickets And Concession Products [Member] Purchase Of Movie Tickets And Concession Products [Member] Purchase Of Movie Tickets And Concession Products [Member] Receivables, allowance Less allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for doubtful accounts receivable Less allowance for doubtful accounts PROPERTY AND EQUIPMENT, accumulated depreciation Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated depreciation, property and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total INTANGIBLE ASSETS, accumulated amortization Accumulated amortization Accumulated amortization, ending balance Accumulated amortization, beginning balance Accumulated amortization, intangible assets Accumulated Amortization of Noncurrent Deferred Finance Costs Accumulated amortization, debt issuance costs Accounts Payable, Related Parties Accounts payable, related parties Accounts payable, related party affiliates Retained earnings (distributions in excess of earnings) Retained earnings (distributions in excess of earnings) Ending Balance Beginning Balance Ending Balance Beginning Balance Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Statements Of Income [Abstract] REVENUE: Advertising (including revenue from founding members of $9.7, $28.5, $8.6 and $26.9 million, respectively) Advertising (including revenue from founding members of $8.9 and $9.8, respectively) Advertising revenue Fathom Events Revenue Fathom Events Revenue Fathom Events Fathom events and other, revenue Revenues Revenue loss Revenues Total Revenue OPERATING EXPENSES: Advertising operating costs Advertising operating costs (including $0.6 and $0.6 to related party affiliates, respectively) Advertising costs Fathom Events operating costs. Fathom Events operating costs Fathom Events operating costs (including $0.9 and $2.0 to founding members, respectively) Fathom Events operating costs Other Cost of Services Network costs Related Party Costs Theatre access fees-founding members Theatre access fees - founding members Theatre access fee Selling and marketing costs Selling and marketing costs (including $0.2 and $0.2 to founding members, respectively) Selling and marketing costs Administrative and other costs Administrative and other costs General and Administrative Expense, Total Managing member administrative fee. Managing Member Administrative Fee Administrative fee - managing member Depreciation and amortization Depreciation and amortization Depreciation and amortization Depreciation Depletion And Amortization Operating expenses operating costs Total Operating expenses OPERATING INCOME Consolidated Operating Income OPERATING INCOME (LOSS) NON-OPERATING EXPENSES: Interest Expense, Debt Borrowings Interest on borrowings Interest Expense, Debt, Total Increase (Decrease) in Fair Value of Unhedged Derivative Instruments Change in derivative fair value Change in derivative fair value Change in derivative fair value Gain (loss) from change in fair value on cash flow hedges Amortization of terminated derivatives. Amortization Of Terminated Derivatives Amortization of terminated derivatives Nonoperating Income (Expense) Total Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest INCOME (LOSS) BEFORE INCOME TAXES Provision for Income Taxes Provision for Income Taxes Provision for Income Taxes Income tax expense Total income tax provisions Net Income (Loss) Attributable to Parent Net Income NET INCOME NET INCOME Net income Component of Other Operating Cost and Expense, General [Axis] Component Of Other Operating Cost And Expense Name [Domain] Component of Other Operating Cost and Expense, Name [Domain] Operating Expense [Member] Advertising Operating Cost [Member] Fathom Events Operating Expense [Member]. Fathom Events Operating Expense [Member] Fathom Events Operating Cost [Member] Selling And Marketing Expense [Member] Selling And Marketing Cost [Member] Revenue from Related Parties Revenue from founding members Revenue from related parties Costs And Expenses Related Party Costs to founding members/related party affiliates Advertising operating costs, related party affiliates Statements Of Comprehensive Income [Abstract] OTHER COMPREHENSIVE INCOME (LOSS): Amount after tax of reclassification adjustments of other comprehensive income (loss). Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax Amortization of terminated derivatives, net of tax of $0 and $0, respectively Total amounts reclassified from AOCI Total amounts reclassified from AOCI Amortization of terminated derivatives, net of tax of $0 and $0, respectively Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax Unrealized gain (loss) on cash flow hedges Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax, Total Net unrealized gain (loss) on cash flow hedges, net of tax $0 and $0, respectively Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income COMPREHENSIVE INCOME Statements of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Non-cash share-based compensation Share-based Compensation Non-cash share-based compensation Share-based Compensation, Total Unrealized Gain (Loss) on Derivatives and Commodity Contracts Net unrealized loss (gain) on hedging transactions Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total Amortization of debt issuance costs Amortization of debt issuance costs Amortization of debt issuance costs Changes in operating assets and liabilities: Receivables-net Receivables, net Receivables-net Accounts payable and accrued expenses Accounts payable and accrued expenses Accounts payable and accrued expenses Accounts payable and accrued expenses Increase Decrease In Due To Related Parties Current Amounts due to founding members Amounts due o founding members'. Amounts due to founding members and managing member Amounts due to founding members Other operating Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net cash provided by operating activities CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property and equipment Purchases of property and equipment Purchases of property and equipment Proceeds from Sale of Intangible Assets Payment from founding members for intangible assets Payments to Acquire Intangible Assets Purchases of intangible assets from an affiliates Purchase of intangible assets from affiliate Purchase of intangible assets Net cash used in investing activities Net cash used in investing activities CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from Long-term Lines of Credit Proceeds from borrowings Repayments of Long-term Lines of Credit Repayments of borrowings Repayments of borrowings Payments of Distributions to Affiliates Distributions to founding members and managing member Distribution to founding members Unit settlement for share-based compensation. Unit Settlement For Share Based Compensation Unit settlement of share-based compensation Unit settlement for share-based compensation Net cash used in financing activities Net cash used in financing activities Net cash used in financing activities CHANGE IN CASH AND CASH EQUIVALENTS CHANGE IN CASH AND CASH EQUIVALENTS CHANGE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS: Cash Flow Non cash InvestingAndFinancing Activities Disclosure Abstract CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract Supplemental disclosure of non-cash financing and investing activity: Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest Subsidiary equity (returned) issued for purchase of intangible asset Subsidiary equity issued/returned for purchase of intangible asset Purchase of an intangible asset with equity Noncash or Part Noncash Acquisition, Investments Acquired Increase in cost method investment Supplemental lCash Flow Information Abstract SupplementalCashFlowInformationAbstract Supplemental disclosure of cash flow information: Cash paid for interest Cash paid for interest Interest Paid, Total Cash paid for income taxes Cash paid for income taxes Income Taxes Paid, Net, Total The Company [Abstract] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Basis Of Presentation And Summary Of Significant Accounting Policies The Company Intangible Assets [Abstract] Intangible Assets Disclosure [Text Block] Intangible Assets Related-Party Transactions [Abstract] Related Party Transactions Disclosure TextBlock RELATED-PARTY TRANSACTIONS Related-Party Transactions Borrowings [Abstract] DebtDisclosureTextBlock Borrowings Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure TextBlock Commitments And Contingencies COMMITMENTS AND CONTINGENCIES Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Fair Value Measurement Derivative Instruments And Hedging Activities [Abstract] Derivative Instruments And Hedging Activities Disclosure TextBlock Derivative Instruments And Hedging Activities Derivative Instruments Segment Reporting [Abstract] Segment Reporting Disclosure TextBlock Segment Reporting Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis Of Presentation Use of Estimates, Policy [Policy Text Block] Estimates Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Segment Reporting, Policy [Policy Text Block] Segment Reporting Disclosure of accounting policy for concentration of credit risk and significant customers. Concentration Of Credit Risk And Significant Customers [Policy Text Block] Concentration Of Credit Risk And Significant Customers Income Tax, Policy [Policy Text Block] Income Taxes Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share-Based Compensation New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedule of Related Party Transactions, by Related Party [Table] Affiliated Entity [Member] Related Party Affiliates [Member] Related Party Transaction [Line Items] Schedule of Related Party Transactions [Table Text Block] Schedule Of Related Party Transactions Schedule of Distributions Made to Members or Limited Partners, by Distribution [Text Block] Schedule Of Mandatory Distributions To Members Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution [Text Block] Schedule Of Amounts Due To Founding Members Schedule of incentive distributions made to/from managing members by distribution Text Block. Schedule Of Incentive Distributions Made To From Managing Members By Distribution [Text Block] Schedule Of Amounts Due To/From Managing Member Schedule of Debt [Table Text Block] Schedule Of Outstanding Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Estimated Fair Values Of Company's Financial Instruments Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block] Schedule Of The Effect Of Derivatives On The Financial Statements Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule Of The Effect Of Derivatives Not Designated As Hedging Instruments On The Financial Statements Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule Of Changes In AOCI By Component Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule Of Segment Operating Income Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Summary Of Revenue By Category Segment Reporting Information, by Segment [Axis] Segment [Domain] Reporting Segment [Domain] Fathom Events [Member] Fathom Events [Member] Fathom Events [Member] Legal Entity [Axis] Entity [Domain] Entity [Domain] National CineMedia, LLC. [Member]. National Cinemedia Llc [Member] NCM, LLC. [Member] National CineMedia Inc. [Member] National Cinemedia Inc [Member] NCM Inc. [Member] Regal Entertainment Group [Member] Regal Entertainment Group [Member] Regal [Member] Cinemark Holdings, Inc. [Member] Cinemark Holdings Inc [Member] Cinemark [Member] American MultiCinema Inc. [Member] American Multicinema Inc [Member] AMC [Member] Units of Partnership Interest, Amount Common membership units outstanding Percentage of partnership units outstanding. Percentage Of Partnership Units Outstanding Percentage of common membership units outstanding Membership units conversion ratio. Membership Units Conversion Ratio Membership units exchangeable into common stock ratio Number of customers contributing to more than 10% of outstanding gross receivables. Number Of Customers Contributing To More Than Ten Percent Of Outstanding Gross Receivables Number of customers contributing to more than 10% of outstanding gross receivable balance Concentration Risk, Percentage Percentage of revenue or outstanding gross receivable balance Percentage of revenue Number of types of share-based compensation awards. Number Of Types Of Share Based Compensation Awards Number of types of share-based compensation awards Common membership units issued upon settlement for share-based compensation. Common Membership Units Issued Upon Settlement for Share Based Compensation Common membership units issued upon settlement for share-based compensation Common membership units issued net of units surrendered. Common Membership Units Issued Net Of Units Surrendered Common membership units issued Finite-Lived Intangible Assets, Period Increase (Decrease) Increase/decrease in intangible assets, net Finite-Lived Intangible Assets, Period Increase (Decrease), Total Common membership units retained by founding members. Common Membership Units Retained By Founding Members Common membership units retained "Founding Members" refer to AMC, Regal and Cinemark and their affiliates. Founding Members [Member] Founding Members [Member] Due to Related Parties Cash payment due to founding members/managing member Due to Related Parties, Total Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Integration Payments [Member]. Integration Payments [Member] Integration Payments [Member] Beverage Concessionaire [Member] Beverage Concessionaire [Member] Beverage Concessionaire [Member] Revenue Share From Fathom Events [Member] Revenue Share From Fathom Events [Member] Revenue Share From Fathom Events [Member] Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum [Member] Length of on screen advertising time which founding members purchased. Length Of On Screen Advertising Time Which Founding Members Purchased On-screen advertising time purchased, in seconds Length of on-screen advertising time which founding members have a right to purchase Length of on-screen advertising time which founding members have a right to purchase On-screen advertising time which founding members have right to purchase, in seconds The length of on-screen advertising time to satisfy agreement obligations. Length Of On Screen Advertising Time To Satisfy Agreement Obligations On-screen advertising time to satisfy agreement obligations Affiliates Related Party Transactions, by Related Party [Axis] Affiliates Related Party Transactions, by Related Party [Axis] Affiliates Related Party Transactions, by Related Party [Domain] Affiliates Related Party Transactions By Related Party [Domain] Affiliates Related Party Transactions, by Related Party [Domain] Distribution Made to Member or Limited Partner, Cash Distribution Distribution Distributions Cash payments to members Distributions payable, net Theatre Access Fees Net of Revenues Receivable Theatre Access Fees Net of Revenues Receivable Theatre access fees, net of beverage revenues Accrued Cost And Other Reimbursable Expenses Accrued Cost And Other Reimbursable Expenses Cost and other reimbursement Cost and other reimbursement Distributions payable. Distributions Payable Distributions payable, net Cash payments to members Managing Member [Member] Managing Member [Member] Managing Member [Member] Starplex Operating L.P. [Member] Starplex Operating L P [Member] Starplex [Member] Other Affiliates [Member] Other [Member] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] LIBOR [Member] Libor [Member] LIBOR [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Senior Secured Credit Facility [Member] Senior Secured Credit Facility [Member] Senior Secured Credit Facility [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Term Loan [Member] Term Loan [Member] Term Loan [Member] Revolving Credit Facility Maturing On November Twenty Six Of Two Thousand And Seventeen [Member] Revolving Credit Facility Maturing On November Twenty Six Of Two Thousand And Seventeen [Member] Revolving Credit Facility Due November 26, 2017 [Member] Revolving Credit Facility Maturing On December Thirty First Of Two Thousand And Fourteen [Member] Revolving Credit Facility Maturing On December Thirty First Of Two Thousand And Fourteen [Member] Revolving Credit Facility Due December 31, 2014 [Member] Unsecured Debt [Member] Senior Unsecured Notes [Member] Secured Debt [Member] Senior Secured Notes [Member] Debt Instrument [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Amount of credit facility Debt Instrument, Face Amount Debt instrument, face amount Debt instrument face amount Long-term Debt, Gross Outstanding Balance Outstanding debt Debt Instrument, Maturity Date Maturity Date Maturity date Line of Credit Facility, Commitment Fee Percentage Unused line fee, percent Portion of line of credit facility borrowing capacity. Portion Of Line Of Credit Facility Borrowing Capacity Portion of revolving credit facility Debt Instrument, Basis Spread on Variable Rate Basis spread on variable rate, percent Debt Instrument, Interest Rate During Period Weighted-average interest rate on revolving credit facility, percent Long term Debt Weighted Average Interest Rate Term loan, Weighted average interest rate Senior secured leverage ratio Senior secured leverage ratio Senior secured leverage ratio Debt Instrument, Interest Rate, Stated Percentage Stated interest rate Interest Rate Debt Instrument, Date of First Required Interest Payment Debt Instrument, Date of First Required Interest Payment Date of first required interest payment Incremental percentage increase (decrease) in the stated rate on a debt instrument. Debt Instrument, Interest Rate, Increase (Decrease) Increase in basis points of portion of revolving credit facility Decrease in basis points Minimum [Member] Minimum [Member] Revenue Guarantee Period Revenue Guarantee Period Range of terms, in years Guarantor Obligations, Maximum Exposure, Undiscounted Maximum potential payment Guarantee obligations current carrying amount Carrying amount of minimum revenue guarantees Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Carrying Reported Amount Fair Value Disclosure [Member] Carrying Value [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value [Member] Loans Payable, Fair Value Disclosure Term Loan Notes Payable, Fair Value Disclosure Senior Notes Derivative [Table] Derivative [Line Items] Notional Amount of Interest Rate Cash Flow Hedge Derivatives Amount outstanding related to cash flow hedges Derivative, Maturity Date Maturity date Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Interest Rate Swap [Member] Interest Rate Swaps [Member] Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net Unrealized gain (loss) recognized in NCM, LLC's OCI (Pre-tax) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total Derivative Instruments, Gain (Loss) Recognized in Income, Net Realized loss recognized in interest on borrowings (Pre-tax) Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement Location [Domain] Income Statement and Other Comprehensive Income Location [Domain] Non Operating Expense [Member] Non Operating Expense [Member] Non Operating Expense [Member] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Nondesignated [Member] Not Designated As Hedging Instruments [Member] Derivative Instruments, Gain (Loss) [Line Items] Remaining balance in AOCI reclassified into earnings Change in derivative fair value Net unrealized loss on hedging transactions Net unrealized loss (gain) on hedging transactions Net unrealized loss (gain) on hedging transactions Total Realized loss on derivative instruments Net unrealized hedging transactions Change in derivative fair value Total Amortization on discounted cash flow hedges Amount before tax of reclassification adjustments of other comprehensive income (loss). Reclassification From Accumulated Other Comprehensive IncomeCurrent Period Before Tax Amortization of AOCI on discontinued cash flow hedges Amortization of AOCI on discontinued cash flow hedges Derivatives not designated as hedging instruments gain loss reclassified to nonoperating income expense. Derivatives Not Designated As Hedging Instruments Gain Loss Reclassified To Nonoperating Income Total Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Comprehensive Income (Loss), Net of Tax Net other comprehensive income Net other comprehensive income Advertising Segment [Member] Advertising Segment [Member] Advertising [Member] Schedule of Segment Reporting Information, by Segment [Table] Fathom Events And Other [Member] Fathom Events And Other [Member] Fathom Events And Other [Member] Network, Administrative And Unallocated Costs [Member] Network Administrative And Unallocated Costs [Member] Network, Administrative And Unallocated Costs [Member] Segment Reporting Information [Line Items] Segment reporting information, operating costs. Segment Reporting Information, Operating Costs Operating costs Other General and Administrative Expense Administrative and other costs Segment reporting information, interest and other costs. Segment Reporting Information Interest And Other Costs Interest and other costs National Advertising Revenue [Member] National Advertising Revenue [Member] National Advertising Revenue [Member] Local Advertising Revenue [Member] Local Advertising Revenue [Member] Local Advertising Revenue [Member] Founding Member Advertising Revenue From Beverage Concessionaire Agreements [Member] Founding Member Advertising Revenue From Beverage Concessionaire Agreements [Member] Founding Member Advertising Revenue From Beverage Concessionaire Agreements [Member] Fathom Consumer Revenue [Member] Fathom Consumer Revenue [Member] Fathom Consumer Revenue [Member] Fathom Business Revenue [Member] Fathom Business Revenue [Member] Fathom Business Revenue [Member] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer One [Member] Customer One [Member] Customer One [Member] Customer Two [Member] Customer Two [Member] Customer Two [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable [Member] Receivable [Member] The election made by the founding member to make a cash payment to the Company in lieu of surrendering common units. Founding Member Payment Election [Member] Founding Member Payment Election [Member]