Liquidating Distributions - Schedule of Liquidating Distributions (Detail) (Liquidation Basis of Accounting [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Liquidation Basis of Accounting [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Distributions during the year	$ 244,326	$ 1,180,208	$ 44,554
Less: Liquidating distributions payable at beginning of year	(42,111)	(16,555)	(31,720)
Add: Liquidating distributions payable at end of year	7,714	42,111	16,555
Total	$ 209,929	$ 1,205,764	$ 29,389