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Notes Payable and Credit Agreement - Summary of Credit Agreement and Notes Payable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Credit Facility
 
Debt Instrument [Line Items]  
Average effective interest rate 2.30%
3.25 % notes payable due in next year
 
Debt Instrument [Line Items]  
Annual installments $ 775
Percentage of interest accrued 3.25%