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
	Jun. 30, 2014	Jun. 30, 2013
Restructuring And Related Activities [Abstract]
Balance, beginning of period	$ 28,698	$ 30,855
Less claims allowed during the period	(363)	(1,163)
Balance, end of period	$ 28,335	$ 29,692