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)
3 Months Ended
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Mar. 30, 2018
$ / shares
Dec. 31, 2017
USD ($)
Schedule Of Equity Method Investments [Line Items]        
Equity in earnings $ 8,636,000 $ 10,060,000    
Number of additional common units of NCM received under common unit adjustment agreement | shares 908,042      
Value of common units received from NCM $ 5,012,000 18,363,000    
Remaining term of exhibitor services agreement 19 years      
Number of common units of NCM owned by Company | shares 28,779,904      
Interest in common units of NCM owned by Company 18.00%      
Investment In NCM        
Schedule Of Equity Method Investments [Line Items]        
Equity in earnings $ 4,015,000      
Common unit convertible into share of NCMI common stock, conversion ratio 1      
Estimated fair value of investment using NCM's stock price $ 149,368,000      
NCM stock price | $ / shares     $ 5.19  
Investment in NCM 202,455,000     $ 200,550,000
NCM        
Schedule Of Equity Method Investments [Line Items]        
Equity in earnings 4,015,000 3,241,000    
Investment in NCM 202,455,000     $ 200,550,000
Impairment of investments 0      
NCM | Theatre Properties and Equipment        
Schedule Of Equity Method Investments [Line Items]        
Payment for installation of certain equipment used for digital advertising $ 52,000 $ 18,000