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)
12 Months Ended
Feb. 13, 2007
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
$ / Theatre
Dec. 31, 2014
USD ($)
Schedule Of Equity Method Investments [Line Items]          
Theatre access fees per patron | $ / Theatre       0.07  
Increase in percentage of payment per theatre patron       8.00%  
Duration of percentage increase in theatre access fees per patron       5 years  
Payment per digital screen $ 800,000 $ 1,303,000 $ 1,241,000 $ 1,182,000  
Percentage of annual increase in payment per digital screen       5.00%  
Minimum percentage of aggregate advertising revenue for payment of fees       12.00%  
Remaining term of exhibitor services agreement       19 years  
Number of common units of NCM owned by Company | shares   27,871,862      
Interest in common units of NCM owned by Company   18.00%      
NCM          
Schedule Of Equity Method Investments [Line Items]          
Investment in NCM   $ 200,550,000 189,995,000    
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   $ 102,000 49,000 $ 50,000  
Investment In NCM          
Schedule Of Equity Method Investments [Line Items]          
Common unit convertible into share of NCMI common stock, conversion ratio   1      
Estimated fair value of investment using NCMI's stock price   $ 191,201,000      
NCMI stock price | $ / shares   $ 6.86      
Investment in NCM   $ 200,550,000 $ 189,995,000 $ 183,755,000 $ 178,939,000