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National CineMedia - Additional Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings | $ 15,139 |  | $ 14,158 | $ 33,982 | $ 29,208
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 |  | 1,552 | $ 5,012
Number of common units of NCM owned by Company | shares |  |  | 39,737,700 |  | 39,737,700
Interest in common units of NCM owned by Company |  |  | 25.00% |  | 25.00%
Investment In NCM |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings |  |  |  | 14,062 |
Common unit convertible into share of NCMI common stock, conversion ratio |  | 1 |  |  |
Estimated fair value of investment using NCM's stock price |  |  | $ 325,849 |  | $ 325,849
NCMI common stock price | $ / shares |  |  | $ 8.20 |  | $ 8.20
NCM |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Remaining performance obligations | 174,000 |  |  | $ 174,000 |
Deferred revenue amortization year and month |  |  |  | 2037-02 |
Equity in earnings | 9,050 |  | $ 6,830 | $ 14,062 | $ 11,341
Deferred revenue or NCM screen advertising advances extended term |  |  |  | 2041-02 |
Recognized incremental screen advertising revenue and offsetting interest expense | $ 4,666 |  | $ 4,983 | $ 14,180 | $ 14,875
NCM | Minimum |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of incremental borrowing rates |  |  |  | 4.40% |
NCM | Maximum |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of incremental borrowing rates |  |  |  | 8.00% |

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