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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Receivables, allowance for doubtful accounts $ 667us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 784us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and Equipment, accumulated depreciation 246,881us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 241,295us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Capitalized Software, accumulated amortization $ 228,815us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization $ 218,514us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
SEI Investments shareholders' equity:    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 750,000,000us-gaap_CommonStockSharesAuthorized 750,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 166,071,000us-gaap_CommonStockSharesIssued 166,688,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 166,071,000us-gaap_CommonStockSharesOutstanding 166,668,000us-gaap_CommonStockSharesOutstanding