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Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 403,478	$ 431,512	$ 403,478
Less: Accumulated depreciation	(259,501)	(285,322)	(259,501)
Property and Equipment, net	143,977	146,190	143,977
Depreciation expense		26,440	24,044	$ 22,448
Loss on write off of purchased software related to the SEI Wealth Platform		0	(6,055)	$ 0
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	151,604	152,171	151,604
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	86,941	106,759	86,941
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	10,003	10,030	10,003
Purchased software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	122,433	128,008	122,433
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	16,143	17,292	16,143
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	15,393	15,175	15,393
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 961	$ 2,077	$ 961
SEI Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Income statement classification for purchased software write off related to the SEI Wealth Platform	Facilities, supplies and other costs
SEI Wealth Platform [Member] | Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Loss on write off of purchased software related to the SEI Wealth Platform	$ 522
Private Banks [Member] | SEI Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Segment classification for purchased software write off related to the SEI Wealth Platform	Private Banks

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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