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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Contractors [Line Items] |  |  |
Unbilled revenue, net | $ 135,289 |  | $ 126,087
Contract retainages, net | 88,986 |  | 91,022
Contract assets, net | 224,275 |  | $ 217,109
Changes in contract assets, net | 7,658 | $ 14,218 |
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in unbilled revenue, net | 9,202 |  |
Changes in contract retainages, net | (2,036) |  |
Changes in contract assets, net | $ 7,166 |  |

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