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Summary of Gain on Assets Disposition (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value Measurements [Line Items]
Amount of impairment incurred	[1]	$ 31,672	$ 910	$ 46,630	$ 1,860
Combined fair value of assets incurring impairment		$ 107,445	$ 500	$ 154,300	$ 720
[1] Refer to Note (15) for additional information regarding asset impairment charges.

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Assets Fair Value Disclosure 1

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Fair Value Measurements [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=51824106&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=56944662&loc=d3e3602-108585

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