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Impact of COVID-19 - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Domestic | Sep. 30, 2020 USD ($) International | Sep. 30, 2019 USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 Domestic | Sep. 30, 2020 International
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs | $ 524 |  | $ 20,062 |  |  |  |  |  |  |  |
Income taxes | (121,145) | $ 14,053 | (222,398) |  |  |  | $ 64,152 |  |  |  |
Income (loss) income taxes | (269,181) | 46,008 | (600,672) |  |  |  | $ 231,161 |  |  |  |
Impact of COVID-19 |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unpaid and accrued restructuring costs | 9,630 |  | 9,630 | $ 9,630 | $ 9,630 | $ 9,630 |  |  |  |  |
Impact of COVID-19 |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of domestic theaters reopened |  |  |  |  | 252 | 15 |  |  |  |  |
Restructuring costs | 524 |  | 20,062 |  |  |  |  |  |  |  |
Number of Theaters |  |  |  |  |  |  |  |  |  | 14 | 7
Coronavirus Aid Relief And Economic Security Act | Impact of COVID-19 |  |  |  |  |  |  |  |  |  |  |
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes | (121,145) | 14,053 | (222,398) |  |  |  |  |  |  |  |
Income (loss) income taxes | $ (269,181) | $ 46,008 |  |  |  |  |  |  |  |  |
Effective income tax rate | 45.00% | 30.50% |  | 35.00% |  |  |  | 35.00% | 35.00% |  |
Income tax receivable | $ 84,105 |  | 84,105 | $ 84,105 | $ 84,105 | $ 84,105 |  |  |  |  |
Income tax cash refunds |  |  | $ 115,769 |  |  |  |  |  |  |  |

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