Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Financial Assets:
Residential mortgage loans held-for-investment	[1]	$ 690,958	$ 0
Residential mortgage loans held-for-investment, Estimated Fair Value		690,522	0
Financial Liabilities:
Asset-backed securities issued by securitization trusts	[1]	640,283	0
Asset-backed securities issued by securitization trust, Estimated Fair Value		$ 638,455	$ 0

[1] The consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations and liabilities of the VIEs for which creditors do not have recourse to the Company. At September 30, 2015 and December 31, 2014, total assets of the consolidated VIEs were $693 million and $0, respectively, and total liabilities were $642 million and $0, respectively. Please refer to Note 4, “Variable Interest Entities,” for further discussion.