Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Fair Value Inputs Assets Quantitative Information [Line Items]
Loans held for sale, at fair value	$ 59,967	$ 26,716
Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Loans held for sale, at fair value	59,967	26,716
Interest rate caps		3
Fair Value, Measurements, Recurring [Member] \| Comparable Sales [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Loans held for sale, at fair value	$ 47,136	26,716
Fair Value, Measurements, Recurring [Member] \| Discounted Cash Flow [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Interest rate caps		$ 3
Fair Value, Measurements, Recurring [Member] \| Minimum [Member] \| Comparable Sales [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Time Discount	0.00%	0.00%
Fair Value, Measurements, Recurring [Member] \| Minimum [Member] \| Discounted Cash Flow [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Discount rate		0.49%
Fair Value, Measurements, Recurring [Member] \| Maximum [Member] \| Comparable Sales [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Time Discount	1.80%	1.80%
Fair Value, Measurements, Recurring [Member] \| Maximum [Member] \| Discounted Cash Flow [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Discount rate		1.18%

Fair value inputs time discount.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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- Definition

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.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ 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

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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