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Consolidated Statement of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Partners' Capital [Abstract]    
Net income $ 241,613us-gaap_NetIncomeLoss $ 229,017us-gaap_NetIncomeLoss
Other comprehensive income, net of tax and reclassification adjustments:    
Net unrealized gains on investment securities 25,339us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 38,214us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Cash flow hedges adjustments 871us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax  
Foreign currency translation adjustment (2,384)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (136)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Defined benefit plans liability adjustment 4,677us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 820us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total other comprehensive income 28,503us-gaap_OtherComprehensiveIncomeLossNetOfTax 38,898us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income $ 270,116us-gaap_ComprehensiveIncomeNetOfTax $ 267,915us-gaap_ComprehensiveIncomeNetOfTax