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Borrowings Under Repurchase Agreements - Additional Information (Detail) - Line of Credit [Member] |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 29, 2015 USD ($) | Jan. 26, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2015 | Dec. 31, 2014
Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point |  |  |  | 3.50% | 3.50%
Minimum [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point |  |  |  | 2.25% | 2.25%
Maximum [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point |  |  |  | 3.50% | 3.50%
Goldman Facility [Member] | Goldman Sachs [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing under facility |  | $ 52,524,000 |  |  |
Covenant terms, minimum consolidated tangible net worth, amount |  | $ 750,000,000 |  |  |
Covenant terms, maximum debt to tangible net worth ratio |  | 3 |  |  |
Covenant terms, minimum liquidity |  | $ 15,000,000 |  |  |
Line of credit facility, covenant terms, total consolidated indebtedness, percent |  | 5.00% |  |  |
Line of credit facility, covenant terms, minimum net income during any four consecutive quarters |  | $ 1 |  |  |
Covenant terms, minimum EBITDA to interest expense ratio |  | 1.5 |  |  |
Goldman Facility [Member] | Goldman Sachs [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point |  | 3.50% |  |  |
Amended and Restated JPMorgan Facility [Member] | JP Morgan Chase [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing under facility | $ 300,000,000 |  | $ 400,000,000 |  |
Covenant terms, minimum consolidated tangible net worth, amount | $ 750,000,000 |  |  |  |
Covenant terms, maximum debt to tangible net worth ratio | 3 |  |  |  |
Term of debt instrument |  |  | 2 years |  |
Debt extension option |  |  | 1 year |  |
Threshold amount for margin calls (more than) | $ 250,000 |  |  |  |
Covenant terms, minimum consolidated tangible net worth, percentage of net cash proceeds | 75.00% |  |  |  |
Covenant terms, minimum liquidity, percentage | 5.00% |  |  |  |
Covenant terms, consolidated recourse indebtedness | $ 15,000,000 |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Minimum [Member] | JP Morgan Chase [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated fair value of collateral pledged, percentage | 25.00% |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Minimum [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point | 2.25% |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Maximum [Member] | JP Morgan Chase [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated fair value of collateral pledged, percentage | 80.00% |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Maximum [Member] | JP Morgan Chase [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis point | 4.75% |  |  |  |

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- Definition Line of Credit Covenant, Consolidated Recourse Indebtedness + References No definition available. + Details
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- Definition Line of Credit, Covenant, Maximum Debt to Tangible Net Worth Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Minimum Consolidated Tangible Net Worth Covenant, Amount + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Minimum Consolidated Tangible Net Worth Covenant, Percentage of Additional Net Cash Proceeds + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Minimum Net Income During Four Consecutive Quarters + 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 Line of Credit Facility, Threshold Amount for Margin Calls + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, 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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