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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Line of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] Wells Fargo [Member] | Dec. 31, 2012 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] | Dec. 31, 2012 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] Collateral Pledged Type One [Member] | Dec. 31, 2012 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] Collateral Pledged Type Two [Member] | Dec. 31, 2012 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] Collateral Pledged Type Three [Member] | Dec. 31, 2012 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] Collateral Pledged Type Four [Member] | Sep. 30, 2013 Line of Credit [Member] UBS [Member] | Dec. 31, 2013 Line of Credit [Member] UBS [Member] | Dec. 31, 2012 Line of Credit [Member] UBS [Member] | Dec. 31, 2013 Line of Credit [Member] JP Morgan Chase [Member] | Dec. 31, 2012 Line of Credit [Member] JP Morgan Chase [Member] | Feb. 28, 2013 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member] | Apr. 30, 2012 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member] | Jan. 31, 2010 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member] | Dec. 31, 2013 Line of Credit [Member] JP Morgan Chase [Member] One Month LIBOR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Balance | $ 202,033 | $ 225,158 | $ 202,033 | $ 225,158 | $ 47,751 | $ 225,155 |  |  |  |  |  |  |  |  |  | $ 133,899 |  | $ 0 | $ 20,383 |  | $ 3 |  |  |  |
Weighted Average Remaining Maturity |  |  | 3 years 3 months 12 days | 1 year 1 month 6 days | 2 months 12 days | 1 year 1 month 6 days | [1] |  |  |  |  |  |  |  | 4 years | 4 years 8 months 12 days | [1] |  | 1 year 1 month 6 days | [1] | 5 days |  |  |  |
Weighted Average Rate |  |  | 2.40% | 1.80% | 1.20% | 1.80% | [2] |  |  |  |  |  |  |  |  | 2.80% |  |  | 2.70% |  | 2.70% |  |  |  |
Basis point |  |  |  |  |  |  |  | 1.50% | 1.05% | 1.25% | 1.05% | 1.25% | 1.50% | 2.35% |  |  |  |  |  |  |  | 2.50% | 2.50% | 3.00% | 2.50%
[1] | Assumes extension options are exercised.
[2] | Borrowings outstanding under the Wells Facility bear interest at a LIBOR plus 105, 125 basis points, 150 basis points or 235 basis points depending on the collateral pledged.

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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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Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Period Type: | instant

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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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