Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims - Summary of Activity in Reserves for Residual Wind-Down Claims (Detail) (Liquidation Basis of Accounting [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Liquidation Basis of Accounting [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	$ 27,419	$ 29,437	$ 28,698	$ 30,855
Less claims allowed during the period	(988)	(97)	(2,267)	(1,515)
Balance, end of period	$ 26,431	$ 29,340	$ 26,431	$ 29,340