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Summary of Combined Fair Value of Assets Incurred Impairments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Asset Impairment Charges [Abstract]
Number of vessels impaired during the period		77	19
Amount of impairment incurred	[1]	$ 163,423	$ 36,886
Combined fair value of assets incurring impairment		$ 567,975	$ 155,400
[1] Refer to Note (16) for additional information regarding asset impairment charges.

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Assets Fair Value Disclosure 1

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Number of vessels impaired during period.

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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.

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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=98514028&loc=d3e3602-108585

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