Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Residential mortgage loans held-for-investment	[1]	$ 744,462	$ 969,172
Residential mortgage loans held-for-investment, Estimated Fair Value		733,759	959,418
Financial Liabilities:
Asset-backed securities issued by securitization trusts	[1]	728,683	915,486
Asset-backed securities issued by securitization trust, Estimated Fair Value		$ 718,008	$ 907,556

[1] The consolidated balance sheets include assets of consolidated variable interest entities, or 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 December 31, 2016 and December 31, 2015, total assets of the consolidated VIEs were $747 million and $972 million (including accrued interest receivable of $2.5 million and $3.1 million, respectively, and total liabilities were $731 million and $918 million (including accrued interest payable of $2.4 million and $2.9 million), respectively. Please refer to Note 4, “Variable Interest Entities,” for further discussion.