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Accounts Receivable and Allowance for Doubtful Accounts - Summary of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Accounts receivable $ 28,309 $ 29,468
Allowance for doubtful accounts (719) (1,894)
Accounts receivable, net $ 27,590 $ 27,574