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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Contractors [Line Items] |  |  |
Unbilled revenue | $ 150,485 |  | $ 111,153
Contract retainages, net | 88,007 |  | 49,128
Contract assets | 238,492 |  | $ 160,281
Changes in contract assets | 38,910 | $ 40,179 |
Net Period Change [Member] |  |  |
Contractors [Line Items] |  |  |
Changes in unbilled revenue | 39,332 |  |
Changes in contract retainages, net | 38,879 |  |
Changes in contract assets | $ 78,211 |  |

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