Schedule II - Valuation And Qualifying Accounts And Reserves

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation And Qualifying Accounts And Reserves

Schedule II - Valuation and Qualifying Accounts and Reserves								SEI Investments Company and Subsidiaries
Year Ended December 31,			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts		(Deductions)			Balance at End of Year
Allowance for doubtful accounts:
2012	$	924	$	—		$	—	$	(119	)	$	805
2011	1,195		—			—		(271		)	924
2010	3,348		—			—		(2,153		)	1,195
Deferred income tax valuation allowance:
2012	$	8,585	$	(1,706	)	$	—	$	—		$	6,879
2011	9,008		(423		)	—		—			8,585
2010	6,217		1,443			1,348		—			9,008