Subsequent Events - Additional Information (Detail) (USD $)				1 Months Ended
	Jun. 30, 2013	Jun. 07, 2013 Wells Fargo [Member]	Jun. 12, 2013 Citibank [Member]	Jul. 26, 2013 Subsequent Event [Member] Citibank [Member] Second Tranche [Member]	Jun. 30, 2013 Repurchase Agreements [Member]	Jun. 30, 2013 Repurchase Agreements [Member] Subsequent Event [Member]	Jun. 30, 2013 Repurchase Agreements [Member] Subsequent Event [Member] Wells Fargo [Member]
Subsequent Event [Line Items]
Total loans commitments						$ 289,100,000
Aggregate loan commitments funded						233,300,000
Borrowings under existing repurchase facilities					165,239,000	254,000,000
Facility Size	$ 1,000,000,000	$ 250,000,000	$ 250,000,000	$ 250,000,000	$ 1,000,000,000		$ 91,800,000
Availability period				1 year