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Income Before Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Income Before Income Tax [Line Items]      
Domestic $ 784,710us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 743,125us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 725,651us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 45,106us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 52,711us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 61,216us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before taxes on income $ 829,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 795,836us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 786,867us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments