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Consolidated Statements Of Changes In Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital In Excess Of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Beginning balance at Dec. 31, 2012   $ 1,722 $ 624,305 $ 405,914 $ 6,239
Beginning balance, shares at Dec. 31, 2012   172,220,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (68) (19,105) (190,769)  
Purchase and retirement of common stock, shares   (6,789,000)      
Issuance of common stock under the employee stock purchase plan   $ 1 1,950    
Issuance of common stock under the employee stock purchase plan, shares   78,000      
Issuance of common stock upon exercise of stock options   $ 37 64,379    
Issuance of common stock upon exercise of stock options, shares 3,733,000 3,733,000      
Stock-based compensation $ (37,865)   37,865    
Tax benefit on stock options exercised     11,825    
Net income attributable to SEI Investments Company 288,124     288,124  
Dividends declared ($0.50, $0.46 and $0.42 per share) (71,665)     (71,665)  
Other comprehensive loss (5,203)       (4,752)
Total Equity at Dec. 31, 2013 $ 1,156,002 $ 1,692 721,219 431,604 1,487
Ending balance, shares at Dec. 31, 2013   169,242,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (79) (25,345) (252,933)  
Purchase and retirement of common stock, shares   (7,888,000)      
Issuance of common stock under the employee stock purchase plan   $ 1 2,197    
Issuance of common stock under the employee stock purchase plan, shares   73,000      
Issuance of common stock upon exercise of stock options   $ 53 102,646    
Issuance of common stock upon exercise of stock options, shares 5,261,000 5,261,000      
Stock-based compensation $ (13,463)   13,463    
Tax benefit on stock options exercised     20,435    
Net income attributable to SEI Investments Company 318,713     318,713  
Dividends declared ($0.50, $0.46 and $0.42 per share) (77,158)     (77,158)  
Other comprehensive loss (10,382)       (10,382)
Total Equity at Dec. 31, 2014 $ 1,247,613 $ 1,667 834,615 420,226 (8,895)
Ending balance, shares at Dec. 31, 2014 166,688,000 166,688,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (60) (22,984) (266,543)  
Purchase and retirement of common stock, shares   (5,951,000)      
Issuance of common stock under the employee stock purchase plan   $ 1 2,798    
Issuance of common stock under the employee stock purchase plan, shares   69,000      
Issuance of common stock upon exercise of stock options   $ 29 62,716    
Issuance of common stock upon exercise of stock options, shares 2,927,000 2,927,000      
Stock-based compensation $ (17,312)   17,312    
Tax benefit on stock options exercised     16,056    
Net income attributable to SEI Investments Company 331,655     331,655  
Dividends declared ($0.50, $0.46 and $0.42 per share) (82,478)     (82,478)  
Other comprehensive loss (16,395)       (16,395)
Total Equity at Dec. 31, 2015 $ 1,289,720 $ 1,637 $ 910,513 $ 402,860 $ (25,290)
Ending balance, shares at Dec. 31, 2015 163,733,000 163,733,000