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Sale of SEI Asset Korea (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 28, 2013
Sep. 30, 2015
Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of subsidiary $ 0 $ 0   $ 2,791 $ 5,582
Gain on sale of subsidiary, diluted earnings per share impact, net       $ 0.01 $ 0.02
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