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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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- Definition

Amount of increase (decrease) in contract with customer asset net current.

+ References

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- Definition

Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 310
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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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- Definition

Amount before valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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