Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Asset management, administration and distribution fees	$ 948,932	$ 831,720	$ 723,630
Information processing and software servicing fees	285,463	261,691	236,190
Transaction-based and trade execution fees	31,610	32,721	32,702
Total revenues	1,266,005us-gaap_Revenues	1,126,132us-gaap_Revenues	992,522us-gaap_Revenues
Expenses:
Subadvisory, distribution and other asset management costs	149,791	121,989	106,048
Software royalties and other information processing costs	33,522	31,255	26,722
Brokerage commissions	23,002seic_BrokerageCommissions	24,649seic_BrokerageCommissions	23,889seic_BrokerageCommissions
Compensation, benefits and other personnel	376,873	357,453	335,296
Stock-based compensation	13,463	37,865	15,736
Consulting, outsourcing and professional fees	136,818us-gaap_ProfessionalFees	131,399us-gaap_ProfessionalFees	109,828us-gaap_ProfessionalFees
Data processing and computer related	52,512	51,401	46,617
Facilities, supplies and other costs	66,113us-gaap_OccupancyNet	64,613us-gaap_OccupancyNet	60,976us-gaap_OccupancyNet
Amortization	38,679us-gaap_AmortizationOfIntangibleAssets	34,602us-gaap_AmortizationOfIntangibleAssets	33,258us-gaap_AmortizationOfIntangibleAssets
Depreciation	22,448us-gaap_DepreciationNonproduction	22,497us-gaap_DepreciationNonproduction	22,586us-gaap_DepreciationNonproduction
Total expenses	913,221us-gaap_CostsAndExpenses	877,723us-gaap_CostsAndExpenses	780,956us-gaap_CostsAndExpenses
Income from operations	352,784us-gaap_OperatingIncomeLoss	248,409us-gaap_OperatingIncomeLoss	211,566us-gaap_OperatingIncomeLoss
Net gain from investments	614us-gaap_GainLossOnInvestments	659us-gaap_GainLossOnInvestments	14,067us-gaap_GainLossOnInvestments
Interest and dividend income	3,354	3,248	5,696
Interest expense	(458)us-gaap_InterestExpense	(535)us-gaap_InterestExpense	(504)us-gaap_InterestExpense
Equity in earnings of unconsolidated affiliates	127,786	118,076	98,671
Gain on sale of subsidiary	5,582	22,112	0
Other income	0us-gaap_OtherNonoperatingIncomeExpense	43,429us-gaap_OtherNonoperatingIncomeExpense	0us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	489,662	435,398	329,496
Income taxes	170,949us-gaap_IncomeTaxExpenseBenefit	146,924us-gaap_IncomeTaxExpenseBenefit	121,462us-gaap_IncomeTaxExpenseBenefit
Net income	318,713us-gaap_ProfitLoss	288,474us-gaap_ProfitLoss	208,034us-gaap_ProfitLoss
Less: Net income attributable to the noncontrolling interest	0	(350)	(1,186)
Net income attributable to SEI Investments Company	$ 318,713us-gaap_NetIncomeLoss	$ 288,124us-gaap_NetIncomeLoss	$ 206,848us-gaap_NetIncomeLoss
Basic earnings per common share	$ 1.89us-gaap_EarningsPerShareBasic	$ 1.68us-gaap_EarningsPerShareBasic	$ 1.19us-gaap_EarningsPerShareBasic
Shares used to compute basic earnings per share	168,246	171,561	174,295
Diluted earnings per common share	$ 1.85us-gaap_EarningsPerShareDiluted	$ 1.64us-gaap_EarningsPerShareDiluted	$ 1.18us-gaap_EarningsPerShareDiluted
Shares used to compute diluted earnings per share	172,565	175,718	175,872
Dividends declared per common share	$ 0.46	$ 0.42	$ 0.63

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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