Accumulated Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2012

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax

Accumulated other comprehensive income, net of tax, consists of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) on Investments		Accumulated Other Comprehensive Income
Total accumulated comprehensive income at December 31, 2011	$	(2,043	)	$	2,574	$	531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011	1,369			—		1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574	$	1,900
Total comprehensive income for the six months ended June 30, 2012	$	547		$	19	$	566
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2012	(329		)	—		(329		)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2012	$	218		$	19	$	237
Total accumulated comprehensive income at June 30, 2012	$	(1,496	)	$	2,593	$	1,097
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at June 30, 2012	1,040			—		1,040
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2012	$	(456	)	$	2,593	$	2,137