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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 |

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