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Asset-Backed Securities Issued - Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 1,102,195	$ 1,195,574
Residential Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	930,027	1,021,870
Commercial Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	164,626	166,016
Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	283	365
Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	2,328	2,428
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	4,931	4,895
Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	936,096	1,028,124
Sequoia | Residential Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	930,027	1,021,870
Sequoia | Commercial Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Sequoia | Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	147	228
Sequoia | Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,038	1,131
Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	4,884	4,895
Commercial Securitization
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	166,099	167,450
Commercial Securitization | Residential Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0	0
Commercial Securitization | Commercial Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	164,626	166,016
Commercial Securitization | Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	136	137
Commercial Securitization | Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,290	1,297
Commercial Securitization | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 47	$ 0

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- Definition

The carrying value of collateral as of the balance sheet date for the asset-backed securities issued.

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