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Investment in National CineMedia LLC - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items] |  |
Number of additional common units of NCM receive under common unit adjustment agreement | 2,311,482 |
Estimated fair value of additional common units received | $ 10,237 | $ 3,620
Number of common units of NCM owned by Company | 43,161,550 |
Interest in common units of NCM owned by Company | 26.00% |
NCM |  |
Schedule Of Equity Method Investments [Line Items] |  |
Remaining performance obligations | $ 174,000 |
Recognized incremental screen rental revenue and offsetting interest expense | 17,723 | 17,726
Amortization of screen advertising advances | $ 24,003 | $ 23,464
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% |
Investment In NCM |  |
Schedule Of Equity Method Investments [Line Items] |  |
Common unit convertible into share of NCMI common stock, conversion ratio | 1 |
Estimated fair value of investment using NCM's stock price | $ 153,655 |
NCMI common stock price | $ 3.56 |

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