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Selected Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Data [Line Items]
Revenues	$ 160,749	[1]	$ 129,215	[1]	$ 143,722	[1]	$ 167,925	[1]	$ 184,174	$ 218,191	$ 271,923	$ 304,774	$ 601,611	$ 979,062	$ 1,495,517
Asset impairment	64,857		$ 253,422		$ 129,562		$ 36,886		$ 55,540	$ 15,141	$ 31,672	$ 14,958	$ 484,727	$ 117,311	$ 14,525
Early Cancellation of Long-Term Vessel Charter Contract
Quarterly Financial Data [Line Items]
Revenues	$ 39,100
[1] Included in revenues for the fourth quarter is $39.1 million of revenue related to early cancellation of a long-term vessel charter contract.

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Quarterly Financial Data [Line Items]

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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