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Accounts Receivable, Net - Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Balance at beginning of period $ (9,975)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (11,363)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (8,689)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for losses (5,740)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (4,664)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (5,051)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Charge-offs, net of recoveries 3,800us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 6,052us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 2,377us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Balance at end of period $ (11,915)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (9,975)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ (11,363)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent