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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 318,713us-gaap_ProfitLoss	$ 288,474us-gaap_ProfitLoss	$ 208,034us-gaap_ProfitLoss
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(10,189)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(3,760)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	5,904us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized holding (loss) gain on investments:
Unrealized holding gains (losses) during the period, net of income taxes of $(592), $(954) and $86	441us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(1,149)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	341us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for gains realized in net income, net of income taxes of $319, $170 and $50	(634)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(294)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(86)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total other comprehensive (loss) gain, net of taxes	(10,382)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(5,203)us-gaap_OtherComprehensiveIncomeLossNetOfTax	6,159us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	308,331us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	283,271us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	214,193us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive loss (income) attributable to noncontrolling interest	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	101us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(3,006)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to SEI Investments	$ 308,331us-gaap_ComprehensiveIncomeNetOfTax	$ 283,372us-gaap_ComprehensiveIncomeNetOfTax	$ 211,187us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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