Quarterly Financial Data

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Quarterly Financial Data

Quarterly Financial Data (Unaudited)

	For the Three Months Ended
2012	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	237,898		$	241,237		$	251,752		$	261,635
Income before income taxes	$	79,950		$	78,501		$	83,501		$	87,544
Net income attributable to SEI	$	49,965		$	49,555		$	50,743		$	56,585
Basic earnings per share	$	0.28		$	0.28		$	0.29		$	0.33
Diluted earnings per share	$	0.28		$	0.28		$	0.29		$	0.32
Effective income tax rate	37.2		%	36.6		%	39.0		%	35.0		%
Total SIV-related gains	$	2,882		$	1,072		$	3,389		$	5,897
Diluted earnings per share (1)	$	0.01		$	—		$	0.01		$	0.02

 (1) Attributable to SIV-related gains.

	For the Three Months Ended
2011	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	232,493		$	237,760		$	233,227		$	226,247
Income before income taxes	$	92,164		$	82,820		$	74,900		$	68,603
Net income attributable to SEI	$	57,728		$	53,603		$	49,232		$	44,396
Basic earnings per share	$	0.31		$	0.29		$	0.27		$	0.25
Diluted earnings per share	$	0.31		$	0.29		$	0.27		$	0.25
Effective income tax rate	37.1		%	34.7		%	33.8		%	34.7		%
Total SIV-related gains (losses)	$	6,864		$	(1,944	)	$	(792	)	$	(738	)
Diluted earnings per share (2)	$	0.02		$	0.01		$	—		$	—

 (2) Attributable to SIV-related gains (losses).