Revenue Recognition - Cumulative Effect of Revenue Recognition Accounting Change (Detail) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017	[3]	Jun. 30, 2017	[4]	Mar. 31, 2017	[5]	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		$ 2,073	[1]	$ 2,289	[1]	$ 1,735	[1]	$ 608	[1]	$ 718	[2]	$ 959		$ 789		$ 519		$ 6,705		$ 2,985		$ 2,636
Cost of operations																		6,187		2,449		2,249
Income tax expense																		104		69		42
Net loss attributable to common stockholders		(2,775)		$ 2		$ 47		$ 35										(2,691)	[6]	179	[7]	$ 34	[7]
Current assets:
Contracts in progress		704	[8]							621								704	[8]	621
Current liabilities:
Advance billings on contracts		1,954	[8]							32								1,954	[8]	32
Stockholders' equity:
Accumulated deficit		(2,719)	[9]							$ (48)								(2,719)	[9]	$ (48)
ASU 606 [Member] | Recognition Under Previous Guidance [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues																		6,816
Cost of operations																		6,278
Income tax expense																		105
Net loss attributable to common stockholders																		(2,672)
Current assets:
Contracts in progress		704																704
Current liabilities:
Advance billings on contracts		1,954																1,954
Stockholders' equity:
Accumulated deficit	[9]	(2,718)																(2,718)
ASU 606 [Member] | Adjustment [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenues																		(111)
Cost of operations																		(91)
Income tax expense																		(1)
Net loss attributable to common stockholders																		(19)
Stockholders' equity:
Accumulated deficit	[9]	$ (1)																$ (1)

[1] Results in the second, third and fourth quarters of 2018 reflect impacts of the Combination from the Combination Date.

[2] Operating results for the fourth quarter of 2017 were primarily driven by higher fabrication and marine activity in the MENA segment and installation progress on the Inpex Ichthys project.

[3] Operating results for the third quarter of 2017 reflect high quality operational performance, while operating with peak levels of utilization in the MENA segment and progressing on the Inpex Ichthys project.

[4] Operating results for the second quarter of 2017 continued to reflect efficient project execution and higher engineering, fabrication and marine activity and improved productivity on multiple projects primarily in our MENA segment.

[5] The first quarter of 2017 operating results improvement was driven by strong cost management, with significantly lower project costs in our MENA and APAC segments, and improvements in our selling, general and administrative expenses.

[6] The effects of restricted stock, warrants and redeemable preferred stock were not included in the calculation of diluted earnings per share for 2018 due to the net loss for the period.

[7] Approximately 0.5 million and 0.7 million shares underlying outstanding stock-based awards in 2017 and 2016 were excluded from the computation of diluted earnings per share during those periods because the exercise price of those awards was greater than the average market price of our common stock, and the inclusion of such shares would have been antidilutive in each of those years.

[8] Costs incurred in excess of costs recognized (assets) and costs recognized in excess of costs incurred (liabilities) resulted from the exclusion of certain costs when measuring progress toward completion under the cost-to-cost method, prior to our adoption of ASC Topic 606. These remaining amounts will be recognized in Cost of operations as the underlying projects progress.

[9] Includes $20 million of cumulative catch-up adjustment to Retained earnings (Accumulated deficit) on January 1, 2018, upon adoption of ASC 606.