Liquidating Distributions - Proforma of Increase (Decrease) in Net Assets Liquidation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012
Proforma For Additional Liquidating Distributions [Abstract]
Net assets in liquidation, As reported	$ 2,077,458	$ 1,150,707	$ 2,077,458	$ 1,150,707	$ 1,624,717	$ 1,390,181	$ 1,007,366	$ 1,369,239
Net assets in liquidation, Pro forma adjustment - additional liquidating distributions payable due to Settlement Allowance only	(474,765)		(474,765)
Net assets in liquidation, Proforma as adjusted	1,602,693		1,602,693
Net increase (decrease) in net assets in liquidation, As reported	452,741	143,341	687,277	(218,532)
Net increase (decrease) in net assets in liquidation, Pro forma adjustment - additional liquidating distributions payable due to Settlement Allowance only	(474,765)		(474,765)
Net increase (decrease) in net assets in liquidation, Proforma as adjusted	$ (22,024)		$ 212,512