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	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Balance, beginning of period	$ 21,491	$ 27,419	$ 25,406	$ 28,698
Less claims allowed during the period	(1,582)	(988)	(5,497)	(2,267)
Balance, end of period	$ 19,909	$ 26,431	$ 19,909	$ 26,431