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Borrowings Under Repurchase Agreements - Additional Information (Detail) (Line of Credit [Member], USD $) | 9 Months Ended | 12 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended |  | 0 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Dec. 31, 2013 | Apr. 30, 2014 Deutsche Bank AG [Member] | Sep. 30, 2014 JP Morgan Chase [Member] | Dec. 31, 2013 JP Morgan Chase [Member] | Sep. 30, 2014 Wells Fargo [Member] | Dec. 31, 2013 Wells Fargo [Member] | Apr. 30, 2014 Minimum [Member] Deutsche Bank AG [Member] Three Month LIBOR [Member] | Apr. 30, 2014 DB Facility [Member] Deutsche Bank AG [Member] | Sep. 30, 2014 DB Facility [Member] Deutsche Bank AG [Member] | Apr. 30, 2014 DB Facility [Member] Minimum [Member] Deutsche Bank AG [Member] | Apr. 30, 2014 DB Facility [Member] Maximum [Member] Deutsche Bank AG [Member] | Apr. 30, 2014 DB Facility [Member] Maximum [Member] Deutsche Bank AG [Member] Three Month LIBOR [Member] | Sep. 30, 2014 Amended DB Facility [Member] Deutsche Bank AG [Member] | Apr. 25, 2014 JP Morgan Facility [Member] JP Morgan Chase [Member] subsidiary | Jun. 06, 2014 JP Morgan Facility [Member] JP Morgan Chase [Member] | May 22, 2014 JP Morgan Facility [Member] JP Morgan Chase [Member] | May 09, 2014 JP Morgan Facility [Member] JP Morgan Chase [Member] | Apr. 25, 2014 JP Morgan Facility [Member] Maximum [Member] JP Morgan Chase [Member] | Jun. 06, 2014 JP Morgan Amendment Letter [Member] JP Morgan Chase [Member] | May 22, 2014 JP Morgan Amendment Letter [Member] JP Morgan Chase [Member] | May 09, 2014 JP Morgan Amendment Letter [Member] JP Morgan Chase [Member] | Jun. 12, 2014 JP Morgan, Third Amendment and Restatement [Member] JP Morgan Chase [Member] | Oct. 01, 2014 Subsequent Event [Member] Amended DB Facility [Member] Deutsche Bank AG [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 |  | $ 146,814,000 | $ 146,814,000 | $ 146,814,000 | $ 175,000,000 | $ 300,000,000
Expiration period | 2 years 9 months 18 days | 3 years 3 months 12 days |  | 3 months 18 days | 1 year 1 month 6 days | 4 months 24 days | 2 months 12 days |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point |  |  |  |  |  |  |  | 1.80% |  |  |  |  | 2.32% |  |  |  |  |  |  |  |  |  |  |
Margin ratio |  |  |  |  |  |  |  |  |  |  | 125.00% | 181.82% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, covenant terms, minimum shareholder's equity of gross capital proceeds (percentage) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries entered into agreement for temporary waiver of covenant term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Temporary waiver term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |
Line of credit facility, covenant terms, total consolidated indebtedness, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  | 5.00% |
Line of credit facility, covenant terms, total consolidated indebtedness, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,500,000 |  |  |  | $ 15,000,000 |

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- Definition Line of Credit, Covenant, Minimum Shareholder's Equity of Gross Capital Proceeds + References No definition available. + Details
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- Definition Line of Credit, Covenant Terms, Temporary Waiver Term + References No definition available. + Details
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- Definition Line of Credit Facility, Borrowing Margin Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Consolidated Recourse Indebtedness + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Total Recourse Indebtedness, Percent + References No definition available. + Details
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- Definition Number of Subsidiaries, Covenant Terms + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Details
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- Definition 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. + References No definition available. + Details
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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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