Initial Adjustment of Assets to Estimated Net Realizable Value (Detail) (Liquidation Basis of Accounting, USD $) In Thousands, unless otherwise specified	4 Months Ended
	Jul. 31, 2013
Adjustments For Change In Accounting Principle [Line Items]
Initial adjustment of assets to estimated net realizable value	$ 2,883
Adjustments To Fair Value
Adjustments For Change In Accounting Principle [Line Items]
Initial adjustment of assets to estimated net realizable value	3,393
Asset Write Down
Adjustments For Change In Accounting Principle [Line Items]
Initial adjustment of assets to estimated net realizable value	$ (510)