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Investment in National CineMedia LLC - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 05, 2018 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 04, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of additional common units of NCM received under common unit adjustment agreement | shares |  | 1,112,368 |  |  |  |
Value of common units received from NCM |  | $ 3,620 | $ 3,620 | $ 1,552 | $ 5,012 |
Interest in common units of NCM acquired by Company |  |  | 25.00% |  |  |
Number of common units of NCM owned by Company | shares |  |  | 40,850,068 |  |  |
Impairment of long-lived and other assets |  |  | $ 152,706 | 57,001 | 32,372 |
Investment In NCM |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Common unit convertible into share of NCMI common stock, conversion ratio |  | 1 |  |  |  |
Value of common units in cash |  |  |  |  | 78,393 |
Estimated fair value of investment using NCM's stock price |  |  | $ 151,962 |  |  |
NCMI common stock price | $ / shares |  |  | $ 3.72 |  |  |
Impairment of long-lived and other assets |  |  | $ (92,655) |  |  |
NCM |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Remaining performance obligations |  |  | $ 174,000 |  |  |
Deferred revenue amortization year and month |  |  | 2041-02 |  |  |
Number of common units of NCM acquired by Company | shares | 10,738,740 |  |  |  |  |
Value of common units in cash | $ 78,393 |  |  |  | 78,393 |
Common unit price per share | $ / shares | $ 7.30 |  |  |  |  |
Interest in common units of NCM acquired by Company | 25.00% |  |  |  |  | 18.00%
Impairment of long-lived and other assets |  |  | $ 92,655 |  |  |
Deferred revenue or NCM screen advertising advances extended term |  |  | 2041-02 |  |  |
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 |  |  | 8.30% |  |  |
NCM | Theatre Properties and Equipment |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Payment for installation of certain equipment used for digital advertising |  |  | $ 9 | $ 61 | $ 74 |

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