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Notes Payable and Revolving Credit Agreement - Summary of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Proforma Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 16,950 $ 18,034
Less current portion (800) (459)
Long term portion 16,150 17,575
Credit Facility [Member]
   
Proforma Debt Instrument [Line Items]    
Payments/Long term debt, Total 15,750 17,400
3.25 % notes payable due in next year [Member]
   
Proforma Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 1,200 $ 634