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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |
Contract assets | $ 68,157 | $ 78,010 | $ 73,039 | $ 58,266
Change in contract assets – (decrease) increase | (4,882) | 19,744 |  |
Contract liabilities | 198,660 | 152,897 | $ 167,306 | $ 146,162
Change in contract liabilities – increase | (31,354) | (6,735) |  |
Net change | $ (36,236) | $ 13,009 |  |

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