Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues		$ 607,818	$ 519,431
Operating income		68,439	56,039
Interest expense, net		(11,608)	(17,706)
Other non-operating income, net		1,719	560
Income before provision for income taxes		58,550	38,893
Capital expenditures	[1]	18,386	62,849
Depreciation and amortization	[2]	22,776	21,381
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income		144,585	94,335
Operating Segments [Member] | AEA [Member]
Segment Reporting Information [Line Items]
Revenues		113,304	28,131
Operating income		53	183
Capital expenditures	[1]	2,524	5,251
Depreciation and amortization	[2]	7,302	4,013
Operating Segments [Member] | MEA [Member]
Segment Reporting Information [Line Items]
Revenues		345,123	310,052
Operating income		69,183	64,377
Capital expenditures	[1]	3,295	5,852
Depreciation and amortization	[2]	6,248	7,903
Operating Segments [Member] | ASA [Member]
Segment Reporting Information [Line Items]
Revenues		149,391	181,248
Operating income		75,349	29,775
Capital expenditures	[1]	3,039	3,512
Depreciation and amortization	[2]	7,426	7,575
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income	[3]	(76,146)	(38,296)
Capital expenditures	[1],[4]	9,528	48,234
Depreciation and amortization	[2]	$ 1,800	$ 1,890

[1] Liabilities associated with assets acquired during the first quarter of 2018 and 2017 were $10 million and $9 million, respectively.

[2] Depreciation and amortization expense associated with our marine vessels is included in the respective segments in which the vessels were located as of the reporting date.

[3] Corporate and Other operating results for the first quarter of 2018 and 2017 include approximately $14 million in restructuring costs and transaction costs related to the Combination and a $3 million gain on sale of assets, respectively.

[4] Corporate and other capital expenditures in the first quarter of 2017 include the purchase of the Amazon, a pipelay and construction vessel. Following the purchase, we sold this vessel to an unrelated party and simultaneously entered into an 11-year bareboat charter agreement.