Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	[1]	$ 729,032	$ 550,463
Operating income (loss)	[2]	35,993	13,306
Capital expenditures	[3]	31,900	23,972
Depreciation and amortization		20,602	25,327
Drydock amortization		3,940	5,272
Operating Segments [Member] | AEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	62,625	143,313
Operating income (loss)	[2]	(24,921)	16,257
Capital expenditures	[3]	2,585	2,913
Depreciation and amortization		7,143	12,823
Drydock amortization		3,176	3,083
Operating Segments [Member] | MEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	270,255	153,800
Operating income (loss)	[2]	38,467	5,242
Capital expenditures	[3]	2,234	10,114
Depreciation and amortization		4,811	5,738
Drydock amortization		535	613
Operating Segments [Member] | ASA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	396,152	253,350
Operating income (loss)	[2]	25,133	(7,426)
Capital expenditures	[3]	27,008	10,824
Depreciation and amortization		6,389	3,916
Drydock amortization		229	1,576
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	[2]	(2,686)	(767)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	[3]	73	121
Depreciation and amortization		$ 2,259	$ 2,850

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

[2] The AEA segment’s operating loss for the three months ended March 31, 2016 includes an impairment charge of $32 million related to the Agile vessel. The ASA segment’s operating loss for the three months ended March 31, 2015 includes an impairment charge of $4 million related to the DB101.

[3] Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for the three months ended March 31, 2016 exclude $2 million in accrued liabilities related to capital expenditures as of December 31, 2015. Capital expenditures for the three months ended March 31, 2015 include $3 million of cash payments for accrued capital expenditures outstanding as of December 31, 2014.