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Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 Contract | Dec. 31, 2013 Contract
Short-term Debt [Line Items] |  |
Number of Facilities | 17 | 13
Outstanding | $ 1,887,688 | $ 862,763
Residential Loans |  |
Short-term Debt [Line Items] |  |
Number of Facilities | 5 | 5
Outstanding | 1,188,179 | 184,789
Limit | 1,550,000 | 1,400,000
Residential Loans | Minimum |  |
Short-term Debt [Line Items] |  |
Maturity | 2014-12 | 2014-01
Residential Loans | Maximum |  |
Short-term Debt [Line Items] |  |
Maturity | 2015-08 | 2014-12
Commercial Loans |  |
Short-term Debt [Line Items] |  |
Number of Facilities | 2 | 1
Outstanding | 52,895 |
Limit | 340,000 | 100,000
Maturity |  | 2014-04
Commercial Loans | Minimum |  |
Short-term Debt [Line Items] |  |
Maturity | 2015-04 |
Commercial Loans | Maximum |  |
Short-term Debt [Line Items] |  |
Maturity | 2015-09 |
Real Estate Securities |  |
Short-term Debt [Line Items] |  |
Number of Facilities | 10 | 7
Outstanding | $ 646,614 | $ 677,974
Real Estate Securities | Minimum |  |
Short-term Debt [Line Items] |  |
Maturity | 2014-10 | 2014-01
Real Estate Securities | Maximum |  |
Short-term Debt [Line Items] |  |
Maturity | 2014-12 | 2014-02

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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