Service Agreements and Related Party Transactions - Additional Information (Detail) (WMMRC [Member], USD $)	0 Months Ended		3 Months Ended
	Jan. 05, 2015	Oct. 14, 2014 Directors	Mar. 31, 2015	Mar. 31, 2014
Related Party Transaction [Line Items]
Pro Rata Share of the Common Stock Allotment			10,000,000
Percentage of Pro Rata Share of the Common Stock Election			5.00%
Percentage of interest in Litigation Proceeds			50.00%
Principal amount of Runoff Notes			$ 1.00
Lawsuit against number of former directors		16
Litigation settlement amount			$ 37,000,000
Proceeds from litigation settlement amount	9,000,000
Investment Management Agreement And Administrative Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses incurred under the agreements			400,000	400,000
Investment Management Agreement [Member]
Related Party Transaction [Line Items]
Description of fee			fee equal to the product of (x) the ending dollar amount of assets under management during the calendar month in question and (y) .002 divided by 12.
Administrative Services Agreement [Member]
Related Party Transaction [Line Items]
Administrative services agreement fee			$ 110,000