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Sale of SEI Asset Korea (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 28, 2013
SEI Asset Korea Co., Ltd. [Member]
Sep. 30, 2012
SEI Asset Korea Co., Ltd. [Member]
Sep. 30, 2013
SEI Asset Korea Co., Ltd. [Member]
Sep. 30, 2012
SEI Asset Korea Co., Ltd. [Member]
Dec. 31, 2012
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Closing date, sale of subsidiary                 Mar. 28, 2013    
Contingent purchase price from sale of SEI AK                 $ 11,220    
Gain on sale of subsidiary (Note 13) 0 0 22,112 0              
Gain on sale of subsidiary, diluted earnings per share Impact, net     $ 0.08                
Expected proceeds by Company from purchase price from sale of SEI AK                 56,879    
Sale of subsidiary transaction costs                 2,545    
Proceeds received at closing, net of transaction costs                 54,334    
Percentage of ownership before sale of subsidiary             56.10%        
Assets 1,391,699   1,391,699   1,309,824           54,783
Cash and cash equivalents 527,214 397,677 527,214 397,677 452,247 420,986         48,306
Business segment that includes operating results of SEI AK             Private Banks        
Revenues             2,889 2,779   8,632  
Net income 67,195 51,086 222,959 151,060     796 729   1,817  
Less: Income attributable to the noncontrolling interests 0 (343) (350) (797)     (350) (343)   (797)  
Net income attributable to SEI AK             $ 446 $ 386   $ 1,020