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Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
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Mar. 31, 2012
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Apr. 30, 2011
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Feb. 28, 2009
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Dec. 31, 2012
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Dec. 31, 2011
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| Line of Credit Facility [Line Items] | |||||
| Line of credit facility, amount outstanding | $ 13,025,000 | $ 16,273,000 | |||
| Line of credit facility, current borrowing capacity | 30,000,000 | ||||
| Line of credit facility, maximum borrowing capacity | $ 35,000,000 | ||||
| Line of credit facility, interest rate description | LIBOR plus 1.75 | LIBOR plus from 1.75% to 2.25 | LIBOR plus 1 1/2 | LIBOR plus 1.75 | |
| Line of credit facility, interest rate at period end | 1.75% | 1.50% | 1.75% | 1.75% | |
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Minimum
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| Line of Credit Facility [Line Items] | |||||
| Line of credit facility, interest rate at period end | 1.75% | 3.00% | |||
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Maximum
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| Line of Credit Facility [Line Items] | |||||
| Line of credit facility, interest rate at period end | 2.25% | 1.962% | |||