Loans Receivable - Interest, Dividend and Discount Accretion Income (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2014	Sep. 30, 2013	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Receivables [Abstract]
Interest on loan assets	$ 899	$ 3,011	$ 5,770		$ 10,912
Exit fee/prepayment penalty			1,787
Accretion of loan discount	495	806	2,086	2,086	2,283
Interest and dividends on REIT securities		100			350
Total interest, dividends, and discount accretion	$ 1,394	$ 3,917	$ 9,643		$ 13,545