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Contract Assets and Liabilities - Summary of Contract Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contractors [Line Items] |  |  |
Unbilled revenue | $ 97,543 | $ 126,087 |
Contract retainages, net | 88,260 | 91,022 |
Contract assets | 185,803 | 217,109 |
Changes in contract assets | (31,360) | $ 16,443 | $ 28,141
Net Period Change |  |  |
Contractors [Line Items] |  |  |
Changes in unbilled revenue | (28,544) |  |
Changes in contract retainages, net | (2,762) |  |
Changes in contract assets | $ (31,306) |  |

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