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Notes Payable and Revolving Credit Agreement - Additional Information (Detail) (USD $) | 9 Months Ended |  |  | 9 Months Ended |  |  |  |
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Sep. 30, 2013 | Dec. 31, 2012 | Mar. 18, 2009 | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member] | Sep. 30, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member] | Jul. 14, 2011 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member] | Jun. 04, 2008 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member] | Aug. 27, 2007 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Proforma Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility commitment |  |  |  |  |  |  | $ 75,000,000 | $ 50,000,000 | $ 30,000,000
Purchase of common stock under credit agreement |  |  | 15,000,000 |  |  |  |  |  |
Company's consolidated leverage ratio | Less than 1.0 to 1.0 |  |  |  |  |  |  |  |
Retirement period of stock repurchased | 7 days |  |  |  |  |  |  |  |
Maturity start date | Aug. 31, 2011 |  |  |  |  |  |  |  |
Maturity end date | Aug. 31, 2015 |  |  |  |  |  |  |  |
Spread on Libor variable rate |  |  |  | 1.60% | 2.50% |  |  |  |
Spread on base variable rate |  |  |  | 0.10% | 1.00% |  |  |  |
Special Dividend | $ 0.40 |  |  |  |  |  |  |  |
Percentage of unused commitment fee |  |  |  | 0.10% | 0.25% |  |  |  |
Revolving credit outstanding | 15,125,000 | 18,034,000 |  |  |  | 14,150,000 |  |  |
Remaining revolving credit outstanding |  |  |  |  |  | $ 60,850,000 |  |  |

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