XML 81 R51.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies - Expected Amortization Expenses (Details) $ in Thousands | Dec. 31, 2024 USD ($)
--- | ---
Accounting Policies [Abstract] |
2025 | $ 28,556
2026 | 27,550
2027 | 25,932
2028 | 23,995
2029 | $ 22,384

X
- Definition Capitalized Computer Software, Expected Amortization, Year Five + References No definition available. + Details
Name: | seic_CapitalizedComputerSoftwareExpectedAmortizationYearFive
Namespace Prefix: | seic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Computer Software, Expected Amortization, Year Four + References No definition available. + Details
Name: | seic_CapitalizedComputerSoftwareExpectedAmortizationYearFour
Namespace Prefix: | seic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Computer Software, Expected Amortization, Year One + References No definition available. + Details
Name: | seic_CapitalizedComputerSoftwareExpectedAmortizationYearOne
Namespace Prefix: | seic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Computer Software, Expected Amortization, Year Three + References No definition available. + Details
Name: | seic_CapitalizedComputerSoftwareExpectedAmortizationYearThree
Namespace Prefix: | seic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Computer Software, Expected Amortization, Year Two + References No definition available. + Details
Name: | seic_CapitalizedComputerSoftwareExpectedAmortizationYearTwo
Namespace Prefix: | seic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration