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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 |  |

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