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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

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