Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for 2014, 2013 and 2012 are:

	For the Year Ended December 31, 2014
	Net income attributable to SEI (Numerator)		Shares (Denominator)	Per-Share Amount
Basic earnings per common share	$	318,713	168,246,000	$	1.89
Dilutive effect of stock options	—		4,319,000
Diluted earnings per common share	$	318,713	172,565,000	$	1.85

	For the Year Ended December 31, 2013
	Net income attributable to SEI (Numerator)		Shares (Denominator)	Per-Share Amount
Basic earnings per common share	$	288,124	171,561,000	$	1.68
Dilutive effect of stock options	—		4,157,000
Diluted earnings per common share	$	288,124	175,718,000	$	1.64

	For the Year Ended December 31, 2012
	Net income attributable to SEI (Numerator)		Shares (Denominator)	Per-Share Amount
Basic earnings per common share	$	206,848	174,295,000	$	1.19
Dilutive effect of stock options	—		1,577,000
Diluted earnings per common share	$	206,848	175,872,000	$	1.18