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Valuation and Qualifying Accounts (Detail) - Summarized Activity in Allowances (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 7,000us-gaap_ValuationAllowancesAndReservesBalance $ 6,400us-gaap_ValuationAllowancesAndReservesBalance $ 7,260us-gaap_ValuationAllowancesAndReservesBalance
Additions Charged to Expense 2,950us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 2,350us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 1,930us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Additions Charged Against Revenues 3,240us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts 5,050us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts 1,860us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
Deductions from Reserve (6,490)us-gaap_ValuationAllowancesAndReservesDeductions (6,800)us-gaap_ValuationAllowancesAndReservesDeductions (4,650)us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Year $ 6,700us-gaap_ValuationAllowancesAndReservesBalance $ 7,000us-gaap_ValuationAllowancesAndReservesBalance $ 6,400us-gaap_ValuationAllowancesAndReservesBalance