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Notes Payable and Revolving Credit Agreement - Summary of Notes Payable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Credit Facility [Member]
 
Proforma Debt Instrument [Line Items]  
Average effective interest rate 3.00%
3.25 % notes payable due in next year [Member]
 
Proforma Debt Instrument [Line Items]  
Annual installments $ 800
Percentage of Interest accrues 3.25%