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Sale of SEI Asset Korea (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 28, 2013
SEI Asset Korea Co., Ltd. [Member]
Dec. 31, 2013
SEI Asset Korea Co., Ltd. [Member]
Dec. 31, 2012
SEI Asset Korea Co., Ltd. [Member]
Dec. 31, 2011
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Contingent purchase price from sale of SEI AK           $ 11,220    
Gain on sale of subsidiary   22,112 0 0        
Gain on sale of subsidiary, diluted earnings per share impact, net $ 0.08              
Gain on sale of subsidiary, basic 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             54,783  
Cash and cash equivalents             48,306  
Revenues and Net Income Included on Company's Consolidated Statement of Operations                
Revenues         2,889   11,514 11,932
Net income         796   2,703 3,851
Less: Income attributable to the noncontrolling interests         (350)   (1,186) (1,691)
Net income attributable to SEI AK         $ 446   $ 1,517 $ 2,160