Accumulated Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2012

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

Accumulated Comprehensive Income (Loss)

Accumulated Comprehensive Income (Loss)

Comprehensive income consists of net income and other gains and losses affecting shareholders’ equity that are excluded from net income. For the Company, comprehensive income includes unrealized gains and losses on available for sale securities and foreign currency translation adjustments. The Company presents comprehensive income in its Consolidated Statements of Comprehensive Income. Components of Accumulated other comprehensive income (loss) consisted of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) on Investments		Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive income (loss) at January 1, 2010	(1,053		)	960		(93		)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2010	1,351			—		1,351
Total accumulated comprehensive income attributable to SEI Investments Company at January 1, 2010	$	298		$	960	$	1,258
Total comprehensive income	2,205			379		2,584
Less: Total comprehensive income attributable to noncontrolling interest	(685		)	—		(685		)
Total comprehensive income attributable to SEI Investments Company	$	1,520		$	379	$	1,899
Total accumulated comprehensive income at December 31, 2010	1,152			1,339		2,491
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010	666			—		666
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010	$	1,818		$	1,339	$	3,157
Total comprehensive loss	(3,195		)	1,235		(1,960		)
Less: Total comprehensive loss attributable to noncontrolling interest	703			—		703
Total comprehensive loss attributable to SEI Investments Company	$	(2,492	)	$	1,235	$	(1,257	)
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	5,904			255		6,159
Less: Total comprehensive income attributable to noncontrolling interest	(1,820		)	—		(1,820		)
Total comprehensive income attributable to SEI Investments Company	$	4,084		$	255	$	4,339
Total accumulated comprehensive income at December 31, 2012	3,861			2,829		6,690
Less: Total accumulated comprehensive income attributable to noncontrolling interest at December 31, 2012	(451		)	—		(451		)
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2012	$	3,410		$	2,829	$	6,239