Quarterly report pursuant to Section 13 or 15(d)

Investment in National CineMedia - Additional Information (Detail)

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Investment in National CineMedia - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 05, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Jul. 04, 2018
Schedule Of Equity Method Investments [Line Items]              
Equity in earnings   $ 14,158   $ 10,902 $ 29,208 $ 26,767  
Number of additional common units of NCM received under common unit adjustment agreement | shares     908,042        
Value of common units received from NCM     $ 5,012   $ 5,012 18,363  
Remaining term of exhibitor services agreement     19 years        
Interest in common units of NCM acquired by Company   25.00%     25.00%    
Number of common units of NCM owned by Company | shares   39,518,644     39,518,644    
Investment In NCM              
Schedule Of Equity Method Investments [Line Items]              
Equity in earnings         $ 11,341    
Common unit convertible into share of NCMI common stock, conversion ratio     1        
Estimated fair value of investment using NCM's stock price   $ 418,502     $ 418,502    
NCMI common stock price | $ / shares   $ 10.59     $ 10.59    
NCM              
Schedule Of Equity Method Investments [Line Items]              
Equity in earnings   $ 6,830   $ 5,032 $ 11,341 8,098  
Number of common units of NCM acquired by Company | shares 10,738,740            
Value of common units in cash $ 78,393            
Common unit price per share | $ / shares $ 7.30            
Interest in common units of NCM acquired by Company 25.00%           18.00%
NCM | Theatre Properties and Equipment              
Schedule Of Equity Method Investments [Line Items]              
Payment for installation of certain equipment used for digital advertising         $ 67 $ 75