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Components of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 33,369 $ 30,211
Allowance for doubtful accounts (7,172) (7,021)
Accounts receivable, net $ 26,197 $ 23,190