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Summary of Transactions with Each of the Company's Other Investees (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]        
Total revenues $ 434,821 $ 35,478 $ 843,834 $ 588,068
AC JV, LLC | Film rentals and advertising        
Schedule Of Equity Method Investments [Line Items]        
Event fees [1]     1,386 2,258
Digital Cinema Distribution Coalition        
Schedule Of Equity Method Investments [Line Items]        
Payments for content delivery services [1]     377 208
FE Concepts, LLC | Theatre Services        
Schedule Of Equity Method Investments [Line Items]        
Total revenues [2]     $ (47) $ (19)
[1] Included in film rentals and advertising costs on the condensed consolidated statements of income.
[2] Included in other revenues on the condensed consolidated statements of income.