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Borrowings Under Repurchase Agreements - Weighted Average Maturities and Interest Rates of Borrowings (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Balance	$ 735,437
Line of Credit [Member]
Debt Instrument [Line Items]
Debt Balance	$ 735,437	$ 622,194
Weighted Average Remaining Maturity	2 years 6 months	3 years 2 months 12 days
Weighted Average Rate	3.00%	3.20%
Line of Credit [Member] | Wells Fargo [Member]
Debt Instrument [Line Items]
Debt Balance	$ 0	$ 20,166
Weighted Average Remaining Maturity		2 months 12 days
Weighted Average Rate	0.00%	1.00%
Line of Credit [Member] | Wells Fargo [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis point		0.80%
Line of Credit [Member] | UBS [Member]
Debt Instrument [Line Items]
Debt Balance	$ 133,899	$ 133,899
Weighted Average Remaining Maturity	3 years	3 years 8 months 12 days
Weighted Average Rate	2.80%	2.80%
Line of Credit [Member] | DB Facility [Member]
Debt Instrument [Line Items]
Debt Balance	$ 300,005	$ 300,005
Weighted Average Remaining Maturity	2 years 6 months	3 years 3 months 18 days
Weighted Average Rate	3.70%	3.70%
Line of Credit [Member] | JP Morgan Chase [Member]
Debt Instrument [Line Items]
Debt Balance	$ 253,481	$ 168,124
Weighted Average Remaining Maturity	2 years 3 months 18 days	1 month 6 days
Weighted Average Rate	2.50%	2.70%
Line of Credit [Member] | Goldman Sachs [Member]
Debt Instrument [Line Items]
Debt Balance	$ 48,052	$ 0
Weighted Average Remaining Maturity	3 years 7 months 6 days
Weighted Average Rate	3.70%	0.00%
Line of Credit [Member] | Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis point	3.50%	3.50%
Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]
Debt Instrument [Line Items]
Basis point	1.80%	1.80%
Minimum [Member] | Line of Credit [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis point	2.25%	2.25%
Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]
Debt Instrument [Line Items]
Basis point	2.32%	2.32%
Maximum [Member] | Line of Credit [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis point	3.50%	3.50%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.16)



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.16)



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 19, 20, 22



-Article 5

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of long-term debt outstanding.

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