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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Contractors [Line Items] |  |  |
Unbilled revenue | $ 126,087 | $ 111,153 |
Contract retainages, net | 91,022 | 49,128 |
Contract assets | 217,109 | 160,281 |
Changes in contract assets | 16,443 | $ 28,141 | $ 17,857
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in unbilled revenue | 14,934 |  |
Changes in contract retainages, net | 41,894 |  |
Changes in contract assets | $ 56,828 |  |

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