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Accounts Receivable and Allowance for Doubtful Accounts - Summary of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Accounts receivable $ 27,867 $ 29,178
Allowance for doubtful accounts (499) (650)
Accounts receivable, net $ 27,368 $ 28,528