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Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share, Net income attributable to SEI (Numerator) | $ 77,097 us-gaap_NetIncomeLoss | $ 83,983 us-gaap_NetIncomeLoss | $ 82,813 us-gaap_NetIncomeLoss | $ 74,820 us-gaap_NetIncomeLoss | $ 65,515 us-gaap_NetIncomeLoss | $ 67,195 us-gaap_NetIncomeLoss | $ 83,494 us-gaap_NetIncomeLoss | $ 71,920 us-gaap_NetIncomeLoss | $ 318,713 us-gaap_NetIncomeLoss | $ 288,124 us-gaap_NetIncomeLoss | $ 206,848 us-gaap_NetIncomeLoss
Shares used to compute basic earnings per share |  |  |  |  |  |  |  |  | 168,246 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 171,561 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 174,295 us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Basic earnings per common share | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 1.89 us-gaap_EarningsPerShareBasic | $ 1.68 us-gaap_EarningsPerShareBasic | $ 1.19 us-gaap_EarningsPerShareBasic
Dilutive effect of stock options, Net income attributable to SEI (Numerator) |  |  |  |  |  |  |  |  | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Dilutive effect of stock options, shares |  |  |  |  |  |  |  |  | 4,319 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 4,157 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 1,577 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted earnings per common share, Net income attributable to SEI (Numerator) |  |  |  |  |  |  |  |  | $ 318,713 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 288,124 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 206,848 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares used to compute diluted earnings per share |  |  |  |  |  |  |  |  | 172,565 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 175,718 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 175,872 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.43 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 1.85 us-gaap_EarningsPerShareDiluted | $ 1.64 us-gaap_EarningsPerShareDiluted | $ 1.18 us-gaap_EarningsPerShareDiluted

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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