$SEIC
SEI INVESTMENTS CO Stock $seic

$seic Overview Financials Valuation SEC Filings Company Website

2021 Q2 Form 10-Q Financial Statement

#000035089421000023 Filed on April 26, 2021

Income Statement

Concept	2021 Q2	2021 Q1	2020 Q1
Revenue	$475.7M	$455.7M	$414.8M
YoY Change	18.72%	9.87%	3.48%
Cost Of Revenue	$81.78M	$73.20M	$69.60M
YoY Change	24.85%	5.17%	2.2%
Gross Profit	$158.3M	$154.4M	$128.2M
YoY Change	34.53%	20.39%	3.73%
Gross Profit Margin	33.29%	33.87%	30.91%
Selling, General & Admin	$234.7M	$227.0M	$214.4M
YoY Change	9.68%	5.88%	2.53%
% of Gross Profit	148.23%	147.07%	167.22%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$8.424M	$8.309M	$7.473M
YoY Change	10.26%	11.19%	1.94%
% of Gross Profit	5.32%	5.38%	5.83%
Operating Expenses	$257.9M	$249.6M	$234.9M
YoY Change	9.82%	6.26%	2.49%
Operating Profit	$136.0M	$132.8M	$110.2M
YoY Change	35.6%	20.51%	6.44%
Interest Expense	$130.0K	$123.0K	$152.0K
YoY Change	-13.91%	-19.08%	-3.18%
% of Operating Profit	0.1%	0.09%	0.14%
Other Income/Expense, Net
YoY Change
Pretax Income	$172.2M	$167.3M	$139.2M
YoY Change	30.75%	20.22%	-4.83%
Income Tax	$38.43M	$37.87M	$29.96M
% Of Pretax Income	22.32%	22.63%	21.52%
Net Earnings	$133.8M	$129.5M	$109.2M
YoY Change	32.37%	18.52%	-4.16%
Net Earnings / Revenue	28.13%	28.41%	26.34%
Basic Earnings Per Share	$0.94	$0.90	$0.73
Diluted Earnings Per Share	$0.93	$0.89	$0.72
COMMON SHARES
Basic Shares Outstanding	142.8M shares	143.5M shares	150.0M shares
Diluted Shares Outstanding	144.2M shares	145.3M shares	152.4M shares

Balance Sheet

Concept	2021 Q2	2021 Q1	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$807.1M	$815.6M	$778.3M
YoY Change	1.74%	4.79%	10.74%
Cash & Equivalents	$780.9M	$782.6M	$746.9M
Short-Term Investments	$26.17M	$33.00M	$31.40M
Other Short-Term Assets	$38.16M	$42.81M	$42.02M
YoY Change	9.01%	1.88%	19.88%
Inventory
Prepaid Expenses
Receivables	$409.6M	$406.0M	$358.1M
Other Receivables	$12.78M	$13.10M	$16.00M
Total Short-Term Assets	$1.311B	$1.325B	$1.233B
YoY Change	6.36%	7.44%	9.36%
LONG-TERM ASSETS
Property, Plant & Equipment	$184.0M	$184.3M	$173.3M
YoY Change	0.97%	6.35%	18.06%
Goodwill	$64.49M	$64.49M	$64.49M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$33.19M	$34.38M	$27.07M
YoY Change	26.93%	27.03%	-11.98%
Long-Term Investments	$184.4M	$173.3M	$159.6M
YoY Change	21.95%	8.58%	-6.99%
Other Assets	$33.08M	$31.72M	$33.30M
YoY Change	-12.3%	-4.74%	1.28%
Total Long-Term Assets	$828.3M	$826.1M	$824.9M
YoY Change	0.93%	0.14%	-0.08%
TOTAL ASSETS
Total Short-Term Assets	$1.311B	$1.325B	$1.233B
Total Long-Term Assets	$828.3M	$826.1M	$824.9M
Total Assets	$2.140B	$2.151B	$2.058B
YoY Change	4.19%	4.51%	5.37%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$9.291M	$5.529M	$13.09M
YoY Change	-13.81%	-57.75%	149.64%
Accrued Expenses	$212.0M	$199.2M	$179.8M
YoY Change	0.6%	10.83%	3.4%
Deferred Revenue	$1.280M	$1.335M	$5.978M
YoY Change	-79.84%	-77.67%	20.06%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$232.9M	$215.9M	$207.6M
YoY Change	-1.37%	4.03%	7.8%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$21.04M	$21.10M	$24.41M
YoY Change	-6.91%	-13.58%	-0.33%
Total Long-Term Liabilities	$21.04M	$21.10M	$24.41M
YoY Change	-6.91%	-13.58%	-0.33%
TOTAL LIABILITIES
Total Short-Term Liabilities	$232.9M	$215.9M	$207.6M
Total Long-Term Liabilities	$21.04M	$21.10M	$24.41M
Total Liabilities	$334.1M	$321.8M	$323.8M
YoY Change	-3.16%	-0.61%	2.27%
SHAREHOLDERS EQUITY
Retained Earnings	$599.2M	$634.7M	$597.5M
YoY Change	5.7%	6.22%	8.17%
Common Stock	$1.221B	$1.210B	$1.172B
YoY Change	3.83%	3.22%	5.32%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.806B	$1.829B	$1.734B
YoY Change
Total Liabilities & Shareholders Equity	$2.140B	$2.151B	$2.058B
YoY Change	4.19%	4.51%	5.37%

Cashflow Statement

Concept	2021 Q2	2021 Q1	2020 Q1
OPERATING ACTIVITIES
Net Income	$133.8M	$129.5M	$109.2M
YoY Change	32.37%	18.52%	-4.16%
Depreciation, Depletion And Amortization	$8.424M	$8.309M	$7.473M
YoY Change	10.26%	11.19%	1.94%
Cash From Operating Activities	$188.4M	$136.6M	$98.97M
YoY Change	14.11%	37.99%	65.23%
INVESTING ACTIVITIES
Capital Expenditures	-$17.14M	$4.218M	$20.67M
YoY Change	-13.87%	-79.6%	182.55%
Acquisitions
YoY Change
Other Investing Activities	-$8.247M	$11.00M	-$1.500M
YoY Change	4023.5%	-833.33%
Cash From Investing Activities	-$25.39M	-$30.66M	-$17.35M
YoY Change	26.94%	76.67%	10.34%
FINANCING ACTIVITIES
Cash Dividend Paid		$53.13M	$52.45M
YoY Change		1.29%	3.33%
Common Stock Issuance & Retirement, Net		$55.68M	$112.0M
YoY Change		-50.27%	36.74%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-168.4M	-$109.5M	-$165.1M
YoY Change	25.42%	-33.65%	24.43%
NET CHANGE
Cash From Operating Activities	188.4M	$136.6M	$98.97M
Cash From Investing Activities	-25.39M	-$30.66M	-$17.35M
Cash From Financing Activities	-168.4M	-$109.5M	-$165.1M
Net Change In Cash	-5.426M	-$2.044M	-$94.58M
YoY Change	-150.24%	-97.84%	11.01%
FREE CASH FLOW
Cash From Operating Activities	$188.4M	$136.6M	$98.97M
Capital Expenditures	-$17.14M	$4.218M	$20.67M
Free Cash Flow	$205.5M	$132.4M	$78.30M
YoY Change	11.1%	69.04%	48.91%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000350894
CY2021Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2021Q1	dei	Amendment Flag AmendmentFlag	false
CY2021Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q1	dei	Document Type DocumentType	10-Q
CY2021Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q1	dei	Entity File Number EntityFileNumber	0-10200
CY2021Q1	dei	Entity Registrant Name EntityRegistrantName	SEI INVESTMENTS COMPANY
CY2021Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	PA
CY2021Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	23-1707341
CY2021Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Freedom Valley Drive
CY2021Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Oaks
CY2021Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
CY2021Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	19456
CY2021Q1	dei	City Area Code CityAreaCode	610
CY2021Q1	dei	Local Phone Number LocalPhoneNumber	676-1000
CY2021Q1	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2021Q1	dei	Trading Symbol TradingSymbol	SEIC
CY2021Q1	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2021Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q1	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	109242000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1685000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-13075000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	160000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-339000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-543000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1131000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	74000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	28000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-253000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-290000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-100000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1231000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1395000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11844000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	130865000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	97398000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1739907000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	129470000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1395000	USD
CY2021Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	66939000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1139000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	14384000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9752000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	1829108000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1738778000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	109242000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11844000	USD
CY2020Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	127432000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1106000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	17487000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6929000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	1734266000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	129470000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	109242000	USD
CY2021Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	7103000	USD
CY2020Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-10270000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136573000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	98972000	USD
CY2021Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4218000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20674000	USD
CY2021Q1	us-gaap	Payments For Software PaymentsForSoftware	6360000	USD
CY2020Q1	us-gaap	Payments For Software PaymentsForSoftware	6458000	USD
CY2021Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	51524000	USD
CY2020Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	29407000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	42446000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	37623000	USD
CY2021Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2020Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	64000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11000000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1500000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-30656000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-17352000	USD
CY2021Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	702000	USD
CY2020Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	633000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	71206000	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	130558000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15523000	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	18593000	USD
CY2021Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	53127000	USD
CY2020Q1	us-gaap	Payments Of Dividends PaymentsOfDividends	52452000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109512000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-165050000	USD
CY2021Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1551000	USD
CY2020Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-11146000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2044000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-94576000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	787727000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	844547000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	785683000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	749971000	USD
CY2021Q1	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	6360000	USD
CY2020Q1	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	6458000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	129470000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	109242000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	143201000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	149468000	shares
CY2021Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2105000	shares
CY2020Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2900000	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	145306000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	152368000	shares
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2021Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	11715000	shares
CY2020Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7408000	shares
CY2021Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	57.99
CY2020Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	58.76
CY2021Q1	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Reclassifications</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year amounts have been reclassified to conform to current year presentation.</span></div>
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	129470000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	109242000	USD
CY2021Q1	us-gaap	Depreciation Nonproduction DepreciationNonproduction	8309000	USD
CY2020Q1	us-gaap	Depreciation Nonproduction DepreciationNonproduction	7473000	USD
CY2021Q1	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	14352000	USD
CY2020Q1	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	13077000	USD
CY2021Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	33350000	USD
CY2020Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	29907000	USD
CY2021Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	28774000	USD
CY2020Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	40226000	USD
CY2021Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9752000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6929000	USD
CY2021Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1207000	USD
CY2020Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	80000	USD
CY2021Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	3915000	USD
CY2020Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1879000	USD
CY2021Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	332000	USD
CY2020Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3989000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	1043000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	360000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-507000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4658000	USD
CY2021Q1	seic	Capitalized Contract Costs Net Of Amortization CapitalizedContractCostsNetOfAmortization	-351000	USD
CY2020Q1	seic	Capitalized Contract Costs Net Of Amortization CapitalizedContractCostsNetOfAmortization	1769000	USD
CY2021Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-992000	USD
CY2020Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1612000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	2020000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	98972000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-2553000	USD
CY2021Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	22016000	USD
CY2020Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	17852000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	4113000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	9728000	USD
CY2021Q1	us-gaap	Increase Decrease Due From Affiliates IncreaseDecreaseDueFromAffiliates	-51266000	USD
CY2020Q1	us-gaap	Increase Decrease Due From Affiliates IncreaseDecreaseDueFromAffiliates	-11810000	USD
CY2021Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2237000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	8663000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-41717000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-36818000	USD
CY2021Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	250000	USD
CY2020Q1	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-1207000	USD
CY2021Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	7103000	USD
CY2020Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-10270000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136573000	USD
CY2021Q1	us-gaap	Billed Contract Receivables BilledContractReceivables	115343000	USD
CY2020Q4	us-gaap	Billed Contract Receivables BilledContractReceivables	99106000	USD
CY2021Q1	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	279919000	USD
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	262167000	USD
CY2021Q1	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	13073000	USD
CY2020Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	25046000	USD
CY2021Q1	seic	Receivables Gross Current ReceivablesGrossCurrent	408335000	USD
CY2021Q1	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	33430000	USD
CY2020Q4	seic	Receivables Gross Current ReceivablesGrossCurrent	386319000	USD
CY2021Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2307000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1100000	USD
CY2021Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	406028000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	385219000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	570572000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	567691000	USD
CY2021Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	386319000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	378639000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	184253000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	189052000	USD
CY2021Q1	us-gaap	Depreciation Nonproduction DepreciationNonproduction	8309000	USD
CY2020Q1	us-gaap	Depreciation Nonproduction DepreciationNonproduction	7473000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	33781000	USD
CY2021Q1	seic	Capitalized Contract Cost Amount Capitalized During Period CapitalizedContractCostAmountCapitalizedDuringPeriod	2372000	USD
CY2020Q1	seic	Capitalized Contract Cost Amount Capitalized During Period CapitalizedContractCostAmountCapitalizedDuringPeriod	2997000	USD
CY2021Q1	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	2723000	USD
CY2020Q1	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	1228000	USD
CY2021Q1	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2021Q1	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	36632000	USD
CY2020Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	95656000	USD
CY2021Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	13023000	USD
CY2020Q4	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	18770000	USD
CY2021Q1	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	32032000	USD
CY2020Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	31907000	USD
CY2021Q1	seic	Accrued Sub Advisory Distribution And Other Asset Management Fees Current AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent	49155000	USD
CY2020Q4	seic	Accrued Sub Advisory Distribution And Other Asset Management Fees Current AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent	49924000	USD
CY2021Q1	us-gaap	Dividends Payable Current DividendsPayableCurrent	0	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	53127000	USD
CY2021Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	33001000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	3507000	USD
CY2021Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	35392000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	46954000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	199235000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	299845000	USD
CY2021Q1	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	33040000	USD
CY2021Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	154636000	USD
CY2020Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	34064000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	145649000	USD
CY2021Q1	seic	Debt Securities Available For Sale And Equity Securities Fvni Cost DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost	112346000	USD
CY2021Q1	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Gain Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax	2627000	USD
CY2021Q1	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Loss Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2021Q1	seic	Debt Securities Available For Sale And Equity Securities Fvni DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI	114973000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Cost DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost	102549000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Gain Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax	2870000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Loss Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI	105419000	USD
CY2021Q1	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1261000	USD
CY2021Q1	seic	Accumulated Other Comprehensive Income Loss Debt Securities Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax	377000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1551000	USD
CY2020Q4	seic	Accumulated Other Comprehensive Income Loss Debt Securities Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax	464000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2021Q1	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	157000	USD
CY2021Q1	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	31000	USD
CY2020Q1	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	189000	USD
CY2020Q1	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	235000	USD
CY2021Q1	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	33040000	USD
CY2020Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	34064000	USD
CY2021Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9752000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6929000	USD
CY2021Q1	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1854000	USD
CY2020Q1	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1381000	USD
CY2021Q1	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7898000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5548000	USD
CY2021Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	101002000	USD
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	11511000	USD
CY2021Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	131300000	USD
CY2021Q1	us-gaap	Share Price SharePrice	60.93
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	39.78
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	17923000	shares
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	6207000	shares
CY2021Q1	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	1142000	USD
CY2021Q1	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-253000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1395000	USD
CY2021Q1	us-gaap	Revenues Revenues	455686000	USD
CY2021Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	301333000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	154353000	USD
CY2020Q1	us-gaap	Revenues Revenues	414762000	USD
CY2020Q1	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	286551000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	128211000	USD
CY2021Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	132837000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	110228000	USD
CY2021Q1	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10578000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2248000	USD
CY2020Q1	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	27120000	USD
CY2021Q1	us-gaap	Depreciation Depreciation	8309000	USD
CY2020Q1	us-gaap	Depreciation Depreciation	7473000	USD
CY2021Q1	us-gaap	Adjustment For Amortization AdjustmentForAmortization	14352000	USD
CY2020Q1	us-gaap	Adjustment For Amortization AdjustmentForAmortization	13077000	USD
CY2021Q1	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	16713000	USD
CY2020Q4	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	15911000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16598000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	15761000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2248000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2105000	USD
CY2021Q1	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	16713000	USD
CY2020Q4	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	15911000	USD
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2105000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18961000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18016000	USD
CY2021Q1	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	6553000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	6546000	USD
CY2021Q1	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	12408000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	11470000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18961000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18016000	USD
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031
CY2020Q1	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031
CY2020Q1	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.011
CY2020Q1	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.022
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2020Q1	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2021Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.226
CY2020Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.215
CY2021Q1	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	7	lawsuit
CY2021Q1	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	7	lawsuit
CY2021Q1	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	921000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	921000	USD
CY2021Q1	us-gaap	Revenues Revenues	455686000	USD
CY2021Q1	us-gaap	Revenues Revenues	455686000	USD
CY2020Q1	us-gaap	Revenues Revenues	414762000	USD
CY2020Q1	us-gaap	Revenues Revenues	414762000	USD

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$SEIC
SEI INVESTMENTS CO Stock $seic

2021 Q2 Form 10-Q Financial Statement

#000035089421000023 Filed on April 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SEIC SEI INVESTMENTS CO Stock $seic

2021 Q2 Form 10-Q Financial Statement

#000035089421000023 Filed on April 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SEIC
SEI INVESTMENTS CO Stock $seic