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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |  |  |
Contract assets | $ 82,986 | $ 68,157 | $ 68,971 | $ 73,039
Change in contract assets – increase (decrease) | 14,015 | (4,882) |  |
Contract liabilities | 311,674 | 198,660 | $ 215,093 | $ 167,306
Change in contract liabilities – increase | (96,581) | (31,354) |  |
Net change | $ (82,566) | $ (36,236) |  |

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