Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims - Summary of Activity in Reserves for Residual Wind-Down Claims (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Restructuring And Related Activities [Abstract]
Balance, beginning of period	$ 29,437	$ 30,973	$ 30,855	$ 32,247
Less claims allowed during the period	(97)	(68)	(1,515)	(1,342)
Balance, end of period	$ 29,340	$ 30,905	$ 29,340	$ 30,905