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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement of Comprehensive Income [Abstract]    
Net income $ 74,820 $ 72,270
Other comprehensive loss, net of tax:    
Foreign currency translation adjustments (1,966) (5,307)
Unrealized gain (loss) on investments:    
Unrealized gains during the period, net of income taxes of $(295) and $41 538 121
Less: reclassification adjustment for gains realized in net income, net of income taxes of $25 and $119 (45) (221)
Net unrealized gain (loss) on investments 493 (100)
Total other comprehensive loss, net of tax (1,473) (5,407)
Comprehensive income 73,347 66,863
Comprehensive loss attributable to the noncontrolling interest 0 101
Comprehensive income attributable to SEI Investments Company $ 73,347 $ 66,964