Fair Value Measurements - Unobservable Inputs Assumptions - Securitized Debt (Detail) - Level 3 - Securitized Debt at Fair Value, Collateralized by Loans Held for Investment	Mar. 31, 2017	Dec. 31, 2016
Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Securitized debt at fair value, collateralized by loans held for investment, CPR Range	1.00%	1.00%
Securitized debt at fair value, collateralized by loans held for investment, CDR Range	0.00%	0.00%
Securitized debt at fair value, collateralized by loans held for investment, Loss Severity Range	35.00%	35.00%
Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Securitized debt at fair value, collateralized by loans held for investment, CPR Range	30.00%	35.00%
Securitized debt at fair value, collateralized by loans held for investment, CDR Range	25.00%	30.00%
Securitized debt at fair value, collateralized by loans held for investment, Loss Severity Range	70.00%	65.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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