Annual report pursuant to Section 13 and 15(d)

Investment in National CineMedia LLC - Additional Information (Detail)

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Investment in National CineMedia LLC - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jul. 05, 2018
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 04, 2018
Schedule Of Equity Method Investments [Line Items]            
Number of additional common units of NCM received under common unit adjustment agreement | shares   1,112,368        
Value of common units received from NCM   $ 3,620 $ 3,620 $ 1,552 $ 5,012  
Interest in common units of NCM acquired by Company     25.00%      
Number of common units of NCM owned by Company | shares     40,850,068      
Impairment of long-lived and other assets     $ 152,706 57,001 32,372  
Investment In NCM            
Schedule Of Equity Method Investments [Line Items]            
Common unit convertible into share of NCMI common stock, conversion ratio   1        
Value of common units in cash         78,393  
Estimated fair value of investment using NCM's stock price     $ 151,962      
NCMI common stock price | $ / shares     $ 3.72      
Impairment of long-lived and other assets     $ (92,655)      
NCM            
Schedule Of Equity Method Investments [Line Items]            
Remaining performance obligations     $ 174,000      
Deferred revenue amortization year and month     2041-02      
Number of common units of NCM acquired by Company | shares 10,738,740          
Value of common units in cash $ 78,393       78,393  
Common unit price per share | $ / shares $ 7.30          
Interest in common units of NCM acquired by Company 25.00%         18.00%
Impairment of long-lived and other assets     $ 92,655      
Deferred revenue or NCM screen advertising advances extended term     2041-02      
NCM | Minimum            
Schedule Of Equity Method Investments [Line Items]            
Percentage Of Incremental Borrowing Rates     4.40%      
NCM | Maximum            
Schedule Of Equity Method Investments [Line Items]            
Percentage Of Incremental Borrowing Rates     8.30%      
NCM | Theatre Properties and Equipment            
Schedule Of Equity Method Investments [Line Items]            
Payment for installation of certain equipment used for digital advertising     $ 9 $ 61 $ 74