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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Contractors [Line Items] |  |  |
Unbilled revenue, net | $ 108,268 |  | $ 97,543
Contract retainages, net | 84,615 |  | 88,260
Contract assets, net | 192,883 |  | $ 185,803
Changes in contract assets, net, Change | 6,991 | $ 7,467 |
Change |  |  |
Contractors [Line Items] |  |  |
Unbilled revenue, net, Change | 10,725 |  |
Contract retainages, net, Change | (3,645) |  |
Changes in contract assets, net, Change | $ 7,080 |  |

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