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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Related to Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Allowance for doubtful accounts beginning of year $ 22,416us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 19,463us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 15,315us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for bad debts 24,412us-gaap_ProvisionForDoubtfulAccounts 18,867us-gaap_ProvisionForDoubtfulAccounts 21,896us-gaap_ProvisionForDoubtfulAccounts
Write-offs (22,986)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (15,914)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (17,748)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Allowance for doubtful accounts end of year $ 23,842us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 22,416us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 19,463us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent