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Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | $ 23,726 |
Equity in loss of affiliates | $ (7,146) | $ (16,077) | (22,061) | $ (27,711)
Investments, ending balance | 23,755 |  | 23,755 |
Other Affiliates |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | 23,726 |
Equity in loss of affiliates |  |  | (15) |
Other |  |  | 44 |
Investments, ending balance | 23,755 |  | 23,755 |
Other Affiliates | AC JV, LLC |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | 3,745 |
Equity in loss of affiliates |  |  | (1,099) |
Investments, ending balance | 2,646 |  | 2,646 |
Other Affiliates | Digital Cinema Distribution Coalition |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | 1,255 |
Equity in loss of affiliates |  |  | 296 |
Investments, ending balance | 1,551 |  | 1,551 |
Other Affiliates | FE Concepts, LLC |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | 18,273 |
Equity in loss of affiliates |  |  | 788 |
Investments, ending balance | 19,061 |  | 19,061 |
Other Affiliates | Other Investments |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Investments, beginning balance |  |  | 453 |
Other |  |  | 44 |
Investments, ending balance | $ 497 |  | $ 497 |

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