Summary of Gain on Assets Disposition (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Amount of impairment incurred	[1]	$ 15,141	$ 6,236	$ 61,771	$ 8,096
Combined fair value of assets incurring impairment		$ 90,010	$ 3,914	$ 244,310	$ 4,634

[1] Refer to Note (15) for additional information regarding asset impairment charges.