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Accounts Receivable, Net - Schedule of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]        
Accounts receivable $ 38,273us-gaap_AccountsReceivableGrossCurrent $ 47,386us-gaap_AccountsReceivableGrossCurrent    
Less: Allowance for doubtful accounts (9,352)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (12,111)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,875)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (4,150)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 28,921us-gaap_AccountsReceivableNetCurrent $ 35,275us-gaap_AccountsReceivableNetCurrent