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Borrowings Under Repurchase Agreements - Weighted Average Maturities and Interest Rates of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2014 Line of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] | Mar. 31, 2014 Line of Credit [Member] Wells Fargo [Member] | Dec. 31, 2013 Line of Credit [Member] Wells Fargo [Member] | Dec. 22, 2011 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Aug. 31, 2010 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Mar. 31, 2014 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Dec. 31, 2013 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Sep. 30, 2013 Line of Credit [Member] UBS [Member] | Mar. 31, 2014 Line of Credit [Member] UBS [Member] | Dec. 31, 2013 Line of Credit [Member] UBS [Member] | Mar. 31, 2014 Line of Credit [Member] JP Morgan Chase [Member] | Dec. 31, 2013 Line of Credit [Member] JP Morgan Chase [Member] | Feb. 28, 2013 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member] | Mar. 31, 2014 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Balance | $ 166,994 | $ 166,994 | $ 202,033 | $ 33,092 | $ 47,751 |  |  |  |  |  |  | $ 133,899 | $ 133,899 | $ 3 | $ 20,383 |  |
Weighted Average Remaining Maturity |  | 3 years 9 months 18 days | 3 years 3 months 12 days | 10 months 24 days | 2 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 |  |
Weighted Average Rate |  | 2.40% | 2.40% | 1.00% | 1.20% |  |  |  |  |  |  | 2.80% | 2.80% | 2.70% | 2.70% |  |
Basis point |  |  |  |  |  | 1.50% | 1.05% | 1.25% | 0.80% | 1.05% |  |  |  |  |  | 2.50% | 2.50%

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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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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- 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 Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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