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Investment in National CineMedia - Additional Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |
Equity in earnings | $ 10,404 | $ 8,636
Number of additional common units of NCM received under common unit adjustment agreement | shares | 219,056 |
Value of common units received from NCM | $ 1,552 | 5,012
Number of common units of NCM owned by Company | shares | 39,737,700 |
Interest in common units of NCM owned by Company | 25.00% |
Investment In NCM |  |
Schedule Of Equity Method Investments [Line Items] |  |
Equity in earnings | $ 4,394 |
Common unit convertible into share of NCMI common stock, conversion ratio | 1 |
Estimated fair value of investment using NCM's stock price | $ 280,151 |
NCMI common stock price | $ / shares | $ 7.05 |
NCM |  |
Schedule Of Equity Method Investments [Line Items] |  |
Equity in earnings | $ 4,394 | $ 4,015

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