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Sale of SEI Asset Korea (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 28, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of subsidiary   $ 2,791 $ 5,582 $ 22,112
Gain on sale of subsidiary, diluted earnings per share impact, net   $ 0.01 $ 0.02 $ 0.08
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      
Revenues and Net Income Included on Company's Consolidated Statement of Operations        
Revenues 2,889      
Net income 796      
Less: Income attributable to the noncontrolling interests (350)      
Net income attributable to SEI AK $ 446