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HELD-FOR-SALE-CLASSIFICATION (Details) - Held for sale - Automation business line $ in Millions | Sep. 30, 2024 USD ($)
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HELD-FOR-SALE-CLASSIFICATION |
Consideration | $ 27.0
Cash consideration | 20.0
Amount held in escrow | $ 7.0

X
- Definition Amount of consideration to be held in Escrow upon the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | iii_DisposalGroupIncludingDiscontinuedOperationAmountToBeHeldInEscrow
Namespace Prefix: | iii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of consideration received or receivable in cash for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | iii_DisposalGroupIncludingDiscontinuedOperationCashConsideration
Namespace Prefix: | iii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=iii_AutomationBusinessLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |