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Notes Payable and Credit Agreement - Summary of Credit Agreement and Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 46,725 $ 41,475
Less current portion (775) (825)
Long term portion 45,950 40,650
Credit Facility
   
Debt Instrument [Line Items]    
Payments/Long term debt, Total 45,500 40,000
3.25 % notes payable due in next year
   
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 1,225 $ 1,475