Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	[1]	$ 805,857	$ 414,595	$ 2,402,857	$ 1,494,489
Operating income (loss)	[2]	29,460	(10,711)	77,657	(17,395)
Capital expenditures	[3]	18,133	61,569	66,118	216,526
Depreciation and amortization		24,611	22,408	75,982	68,655
Drydock amortization		4,252	5,601	13,910	15,567
AEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	96,371	117,509	344,385	425,060
Operating income (loss)	[2]	(19,784)	(11,853)	(125)	(41,855)
Capital expenditures	[3]	3,286	7,249	6,715	47,602
Depreciation and amortization		9,832	7,897	33,119	23,284
Drydock amortization		3,133	3,162	9,377	8,707
MEA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	318,346	91,659	892,367	588,195
Operating income (loss)	[2]	38,981	(17,982)	74,952	(1,049)
Capital expenditures	[3]	2,735	47,354	17,677	76,739
Depreciation and amortization		8,393	7,235	23,150	24,732
Drydock amortization		443	501	1,606	1,398
ASA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	391,140	205,427	1,166,105	481,234
Operating income (loss)	[2]	13,886	21,022	12,273	30,232
Capital expenditures	[3]	11,648	5,316	41,141	83,613
Depreciation and amortization		4,191	5,061	11,969	15,048
Drydock amortization		676	1,938	2,927	5,462
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	[2]	(3,623)	(1,898)	(9,443)	(4,723)
Capital expenditures	[3]	464	1,650	585	8,572
Depreciation and amortization		$ 2,195	$ 2,215	$ 7,744	$ 5,591

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

[2] Operating results for the ASA segment included a $4 million impairment charge for the DB101 and $3 million of loss on disposal of this asset in the first and second quarters of 2015, respectively.

[3] Total capital expenditures include expenditures for which cash payments were made during the period. Capital expenditures for the three and nine months ended September 30, 2015 included $1.2 million and $10.2 million, respectively, of cash payments for accrued capital expenditures outstanding as of December 31, 2014. Capital expenditures for the three months ended September 30, 2014 exclude $9.5 million in accrued liabilities related to capital expenditures and for the nine months ended September 30, 2014 include $18.6 million of cash payments for accrued capital expenditures outstanding as of December 31, 2013.