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Revenue - Contract assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Unbilled revenue |  | $ 249,577 | $ 160,092
Retention receivable |  | 88,953 | 66,586
Contract materials (not yet installed) |  | 25,715 | 39,224
Contract assets |  | 364,245 | $ 265,902
Increase in contract assets |  | $ 98,300 |
Willbros Group, Inc |  |  |
Increase in contract assets | $ 30,800 |  |

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