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Revenue - Contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Deferred revenue		$ 182,232	$ 159,310
Accrued loss provision		7,307	10,067
Contract liabilities		189,539	$ 169,377
Increase in contract liabilities		20,200
Decrease in accrued loss provision		17,900
Revenue recognized included in contract liability at beginning of period		$ 159,400
Willbros Group, Inc
Increase in contract liabilities	$ 63,900

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- Definition

Accrued loss provision component of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

No definition available.

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- Definition

Amount of obligation before accrued loss provision on transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in accrued loss provision.

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- Definition

Amount of increase (decrease) in contract with customers liability current.

+ References

No definition available.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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