Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenues	[1]	$ 519,431	$ 729,032
Operating income (loss)		55,985	35,993
Interest expense, net		(17,706)	(11,238)
Other non-operating income (expense), net		614	(3,391)
Income before provision for income taxes		38,893	21,364
Capital expenditures	[2]	62,849	31,900
Depreciation and amortization		21,381	24,542
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)		94,335	107,794
Operating Segments [Member] | AEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	28,131	62,625
Operating income (loss)		183	16,099
Capital expenditures	[2]	5,251	2,585
Depreciation and amortization		4,013	10,319
Operating Segments [Member] | MEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	310,052	270,255
Operating income (loss)		64,377	46,039
Capital expenditures	[2]	5,852	2,234
Depreciation and amortization		7,903	5,346
Operating Segments [Member] | ASA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	181,248	396,152
Operating income (loss)		29,775	45,656
Capital expenditures	[2]	3,512	27,008
Depreciation and amortization		7,575	6,618
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	[3]	(38,350)	(71,801)
Capital expenditures	[2],[4]	48,234	73
Depreciation and amortization		$ 1,890	$ 2,259

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

[2] Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for the first quarter of 2017 and 2016 exclude $2 million in accrued liabilities related to capital expenditures outstanding as of beginning of each respective period.

[3] Corporate and Other operating results for the first quarter of 2017 and 2016 include a $3 million gain on sale of assets and $32 million impairment charge related to our Agile vessel, 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 third party and simultaneously entered into an 11-year bareboat charter agreement, see Note 8, Sale Leaseback.