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Notes Payable and Revolving Credit Agreement - Summary of Aggregate Annual Payments of Principal Required to Revolving Credit Facility (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Long Term Debt By Maturity [Abstract]    
During the twelve months ended September 30, 2014 $ 575  
During the twelve months ended September 30, 2015 14,550  
During the twelve months ended September 30, 2016     
Payments/Long term debt, Total $ 15,125 $ 18,034