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Sale of SEI Asset Korea (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 28, 2013
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of subsidiary $ 0 $ 0 $ 5,582 $ 22,112  
Gain on sale of subsidiary, diluted earnings per share impact, net     $ 0.02 $ 0.08  
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