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Contract Assets and Liabilities - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Contractors [Line Items] |  |  |
Deferred revenue | $ 165,699 | $ 155,570 |
Accrued loss provision | 2,232 | 2,826 |
Contract liabilities | 167,931 | 158,396 |
Changes in contract liabilities | 9,573 | $ 52,918 | $ 28,163
Net Period Change |  |  |
Contractors [Line Items] |  |  |
Change in deferred revenue | 10,129 |  |
Change in accrued loss provision | (594) |  |
Changes in contract liabilities | $ 9,535 |  |

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