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Borrowings Under Repurchase Agreements - Additional Information (Detail) (Line of Credit [Member], USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 UBS [Member] | Mar. 31, 2014 UBS [Member] | Dec. 31, 2013 UBS [Member] | Sep. 30, 2013 UBS [Member] Six Month LIBOR [Member] | Feb. 28, 2013 JP Morgan Chase [Member] | Mar. 31, 2014 JP Morgan Chase [Member] | Dec. 31, 2013 JP Morgan Chase [Member] | Feb. 28, 2013 JP Morgan Chase [Member] One Month LIBOR [Member] | Mar. 31, 2014 JP Morgan Chase [Member] One Month LIBOR [Member] | Mar. 31, 2014 Wells Fargo [Member] | Dec. 31, 2013 Wells Fargo [Member] | Dec. 22, 2011 Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Wells Fargo [Member] One Month LIBOR [Member] | Aug. 31, 2010 Wells Fargo [Member] One Month LIBOR [Member] | Mar. 31, 2014 Wells Fargo [Member] One Month LIBOR [Member] | Dec. 31, 2013 Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Wells Fargo [Member] One Month LIBOR [Member] Commercial Mortgage Backed Securities [Member] | Jun. 30, 2012 Wells Fargo [Member] One Month LIBOR [Member] Commercial Mortgage Backed Securities [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | $ 133,333,000 |  | $ 133,899,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period | 3 years 9 months 18 days | 3 years 3 months 12 days | 4 years | 4 years 6 months | 4 years 8 months 12 days |  |  | 9 months 18 days | 1 year 1 month 6 days |  |  | 10 months 24 days | 2 months 12 days |  |  |  |  |  |  |
Line of Credit Facility, Period of Potential Extension |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point |  |  |  |  |  | 1.55% |  |  |  | 2.50% | 2.50% |  |  | 1.50% | 1.05% | 1.25% | 0.80% | 1.05% | 1.75% | 2.35%
Line of Credit Facility, Estimated Fair Value of Collateral Pledged Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Margin of Cash Borrowed, Percentage |  |  | 22.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Covenant, Minimum Net Asset Value |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Covenant, Maximum Debt to Tangible Net Worth Ratio |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Threshold Amount for Margin Calls |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Loan Extension Fee Percentage |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |

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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, Covenant, Minimum Net Asset Value + References No definition available. + Details
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- Definition Line of Credit Facility, Estimated Fair Value of Collateral Pledged Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Loan Extension Fee Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Margin of Cash Borrowed, Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Period of Potential Extension + 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 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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