Variable Interest Entities - Summary of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity
Residential loans, held-for-investment	[1]	$ 3,307,249	$ 3,365,003
Accrued interest receivable		69,064	66,044
Deferred costs		10,689	13,080
Total assets	[1]	20,781,346	21,231,017
Asset-backed securities issued by securitization trusts	[1]	2,859,423	2,929,820
Total liabilities	[1]	18,351,979	18,592,167
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity
Residential loans, held-for-investment		3,307,249	3,365,003
Accrued interest receivable		20,211	10,562
Deferred costs		4,482	5,032
Total assets		3,331,942	3,380,597
Accrued interest and accrued expenses payable		16,636	8,692
Asset-backed securities issued by securitization trusts		2,859,423	2,929,820
Total liabilities		2,876,059	$ 2,938,512
Variable Interest Entity, New Primary Beneficiary
Variable Interest Entity
Residential loans, held-for-investment		372,305
Accrued interest receivable		1,236
Total assets		373,541
Accrued interest and accrued expenses payable		1,236
Asset-backed securities issued by securitization trusts		372,305
Total liabilities		$ 373,541

[1] The condensed 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. As of September 30, 2015 and December 31, 2014, total assets of the consolidated VIEs were $3,331,942 and $3,380,597, respectively, and total liabilities of the consolidated VIEs were $2,876,059 and $2,938,512, respectively. Refer to Note 3 - "Variable Interest Entities" for further discussion.