Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	[1]	$ 958,531	$ 558,543	$ 2,266,635	$ 1,994,202
Operating income (loss)		127,072	43,055	270,256	136,036
Interest expense, net		(11,976)	(17,431)	(50,886)	(41,324)
Other non-operating income (expense), net		803	5,237	(1,074)	(1,005)
Income before provision for income taxes		115,899	30,861	218,296	93,707
Capital expenditures	[2]	16,184	26,719	97,106	197,393
Depreciation and amortization		28,347	27,826	78,032	76,755
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)		180,137	90,617	413,544	301,614
Operating Segments [Member] | AEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	61,002	69,699	130,697	219,134
Operating income (loss)		(7,171)	2,871	(18,290)	32,831
Capital expenditures	[2]	5,369	269	20,694	3,795
Depreciation and amortization		5,300	8,992	16,708	28,717
Operating Segments [Member] | MEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	736,291	334,731	1,602,955	922,820
Operating income (loss)		163,626	60,365	345,483	159,701
Capital expenditures	[2]	7,858	8,318	18,489	13,021
Depreciation and amortization		13,224	7,724	34,889	19,632
Operating Segments [Member] | ASA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	161,238	154,113	532,983	852,248
Operating income (loss)		23,682	27,381	86,351	109,082
Capital expenditures	[2]	1,812	16,603	7,548	178,178
Depreciation and amortization		7,966	8,970	20,913	21,877
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	[3]	(53,065)	(47,562)	(143,288)	(165,578)
Capital expenditures	[2]	1,145	1,529	50,375	2,399
Depreciation and amortization		$ 1,857	$ 2,140	$ 5,522	$ 6,529

[1] Intersegment transactions included in revenues were not significant for all the periods presented.

[2] Corporate and Other capital expenditures in the first nine months of 2017 include the purchase of the Amazon, a pipelay and construction vessel. Following the purchase we sold this vessel to an unrelated third party and simultaneously entered into an 11-year bareboat charter agreement, see Note 8, Sale Leaseback.

[3] Corporate and Other operating results:     in 2017 include a $3 million gain on sale of assets.     in 2016 include: o   $44 million of impairment charges, see Note 12, Fair Value Measurements, for further discussion; and o   $11 million of restructuring expenses, see Note 4, Restructuring, for further discussion.