Segment Reporting - Operating Information by Segment (Parenthetical) (Detail) - USD ($)	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018	[3]	Jun. 30, 2018	[3]	Mar. 31, 2018	[3]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Transaction costs	$ 28,000,000	[1]	$ 14,000,000	[1]	$ 11,000,000	[1]	$ 4,000,000	[1]	$ 3,000,000	[2],[3]	$ 5,000,000	[2]	$ 37,000,000	[2]	$ 3,000,000	[2]	$ 57,000,000	$ 48,000,000	$ 9,000,000
Restructuring and integration costs	11,000,000	[4]	14,000,000	[4]	$ 20,000,000	[4]	$ 69,000,000	[4]	28,000,000	[3],[4]	$ 31,000,000	[4]	$ 63,000,000	[4]	$ 12,000,000	[4]	114,000,000	134,000,000	0
Impairment charges			$ 18,000,000	[5]					58,000,000	[3],[5]							18,000,000	58,000,000	1,000,000
Accrued and unpaid capital expenditures reported in PP&E and accrued liabilities	160,000,000								26,000,000								160,000,000	26,000,000	$ 8,000,000
Receivables from unconsolidated affiliates	$ 48,000,000								$ 15,000,000								48,000,000	15,000,000
Amazon Pipe-lay and Construction Vessel [Member]
Segment Reporting Information [Line Items]
Bareboat charter agreement, term																			11 years
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Transaction costs																	57,000,000	48,000,000	$ 9,000,000
Restructuring and integration costs																	114,000,000	134,000,000
Impairment charges																	$ 18,000,000	58,000,000
Expense with need to make alternate arrangements																		$ 25,000,000
Gain on sale of assets																			$ 4,000,000

[1] 2019—primarily relates to legal and other professional fees associated with the sale processes for the pipe fabrication business and the Lummus Technology business and the now-terminated effort to sell our industrial storage tanks business, as well as professional and other fees associated with the Chapter 11 Cases.

[2] 2018—primarily relates to professional service fees (including audit, legal and advisory services) associated with the Combination. See Note 3, Business Combination, for further discussion.

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

[4] Primarily represents costs related to achieve our CPI. See Note 12, Restructuring and Integration Costs, for further discussion.

[5] Represents charges associated with the impairment of vessels and other marine equipment, due to changes in their level of planned utilization. See Note 16, Fair Value Measurements, for further discussion.