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Allowance for Uncollectible Accounts - Allowance for Uncollectible Accounts Activity and Ending Balances (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance $ 14,334us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 11,863us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 10,692us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions (15,780)us-gaap_ProvisionForDoubtfulAccounts (13,929)us-gaap_ProvisionForDoubtfulAccounts (11,875)us-gaap_ProvisionForDoubtfulAccounts
Deductions 11,532us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 11,458us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 10,704us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Ending balance $ 18,582us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 14,334us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 11,863us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent