Reserves for Expected Costs of Liquidation and Residual Wind-Down Claims - Additional Information (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 Cost and Reserve [Line Items]
Liquidation period extended			Dec. 31, 2016
Reserve for Expected Reporting Costs [Member]
Restructuring Cost and Reserve [Line Items]
Net (reduction in) additions to reserves for Expected Costs of Liquidation	$ 68	$ 6,787	$ (4,078)	$ 11,161
Reserve for Expected Wind-Down Costs [Member]
Restructuring Cost and Reserve [Line Items]
Net (reduction in) additions to reserves for Expected Costs of Liquidation	$ 578	$ 6,776	$ (3,485)	$ 7,800