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Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Accounting Policies [Abstract] |  |
Net income | $ 84,611 us-gaap_ProfitLoss | $ 74,820 us-gaap_ProfitLoss
Depreciation | 5,995 us-gaap_DepreciationNonproduction | 5,584 us-gaap_DepreciationNonproduction
Amortization | 10,358 us-gaap_AmortizationOfIntangibleAssets | 9,214 us-gaap_AmortizationOfIntangibleAssets
Equity in earnings of unconsolidated affiliates | (34,033)us-gaap_IncomeLossFromEquityMethodInvestments | (31,891)us-gaap_IncomeLossFromEquityMethodInvestments
Distributions received from unconsolidated affiliate | 37,003 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 31,505 us-gaap_EquityMethodInvestmentDividendsOrDistributions
Stock-based compensation | 3,750 us-gaap_AllocatedShareBasedCompensationExpense | 2,823 us-gaap_AllocatedShareBasedCompensationExpense
Provision for losses on receivables | (117)us-gaap_ProvisionForDoubtfulAccounts | (25)us-gaap_ProvisionForDoubtfulAccounts
Deferred income tax expense | (102)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 4,686 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Gain on sale of SEI AK | (2,791)us-gaap_GainOrLossOnSaleOfStockInSubsidiary | (5,582)us-gaap_GainOrLossOnSaleOfStockInSubsidiary
Net gain from investments | (250)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | (136)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Change in other long-term liabilities | 464 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 705 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Change in other assets | 100 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (3,273)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other | (1,628)us-gaap_OtherNoncashIncomeExpense | (351)us-gaap_OtherNoncashIncomeExpense
Decrease (increase) in Receivables from regulated investment companies | 1,387 us-gaap_IncreaseDecreaseInOtherReceivables | (3,908)us-gaap_IncreaseDecreaseInOtherReceivables
Decrease (increase) in Receivables | (6,137)us-gaap_IncreaseDecreaseInReceivables | (15,453)us-gaap_IncreaseDecreaseInReceivables
Decrease (increase) in Other current assets | (6,835)us-gaap_IncreaseDecreaseInOtherCurrentAssets | (3,266)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Increase (decrease) in Accounts payable | (3,902)us-gaap_IncreaseDecreaseInAccountsPayable | (7,862)us-gaap_IncreaseDecreaseInAccountsPayable
Increase (decrease) in Accrued liabilities | (11,812)us-gaap_IncreaseDecreaseInAccruedLiabilities | (12,199)us-gaap_IncreaseDecreaseInAccruedLiabilities
Increase (decrease) in Deferred revenue | 1,869 us-gaap_IncreaseDecreaseInDeferredRevenue | 101 us-gaap_IncreaseDecreaseInDeferredRevenue
Total adjustments | (6,681)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | (29,328)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities | $ 77,930 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 45,492 us-gaap_NetCashProvidedByUsedInOperatingActivities

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