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Sale of SEI Asset Korea Sale of SEI Asset Korea (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 28, 2013
SEI Asset Korea Co., Ltd. [Member]
Mar. 31, 2013
SEI Asset Korea Co., Ltd. [Member]
Mar. 31, 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 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    
Proceeds received at closing, net of transaction costs           21,612    
Sale of subsidiary transaction costs           2,545    
Proceeds from sale of SEI AK placed in escrow account           32,722    
Percentage of ownership before sale of subsidiary         56.10%      
Assets 1,342,610   1,309,824         54,783
Cash and cash equivalents 452,099 388,127 452,247 420,986       48,306
Business segment that includes operating results of SEI AK         Private Banks      
Revenues of SEI AK         2,889   3,126  
Operating income of SEI AK         796   616  
Less: Net income attributable to the noncontrolling interest (350) (270)     (350)   (270)  
Net income attributable to SEI AK         $ 446   $ 346