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Accumulated Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax
Accumulated other comprehensive income, net of tax, consists of: 
 
Foreign
Currency
Translation
Adjustments
 
Unrealized
Holding
Gains (Losses)
on Investments
 
Accumulated
Other
Comprehensive
(Loss) Income
Total accumulated comprehensive income at December 31, 2012
$
3,861

 
$
2,829

 
$
6,690

Less: Total accumulated comprehensive income attributable to noncontrolling interest at December 31, 2012
(451
)
 
—

 
(451
)
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2012
$
3,410

 
$
2,829

 
$
6,239

 
 
 
 
 
 
Total comprehensive loss for the nine months ended September 30, 2013
$
(3,961
)
 
$
(1,173
)
 
$
(5,134
)
Less: Total comprehensive loss attributable to noncontrolling interest for the nine months ended September 30, 2013
451

 
—

 
451

Total comprehensive loss attributable to SEI Investments Company for the nine months ended September 30, 2013
$
(3,510
)
 
$
(1,173
)
 
$
(4,683
)
 
 
 
 
 
 
Total accumulated comprehensive income at September 30, 2013
$
(100
)
 
$
1,656

 
$
1,556

Less: Total accumulated comprehensive income attributable to noncontrolling interest at September 30, 2013
—

 
—

 
—

Total accumulated comprehensive income attributable to SEI Investments Company at September 30, 2013
$
(100
)
 
$
1,656

 
$
1,556