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Note 6 - Acquisition-related Items - Composition of Acquisition-related Expense (Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Transaction costs | $ 25,937 | $ 14,148
Contingent consideration fair value adjustments (note 22) | (10,977) | (17,698)
Contingent consideration compensation expense / (recovery) (note 4) | (42,762) | 50,646
Business Combination Acquisition Related Costs Including Changes in Contingent Consideration | $ (27,802) | $ 47,096

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs and fair value adjustments for contingent consideration. + References No definition available. + Details
Name: | cigi_BusinessCombinationAcquisitionRelatedCostsIncludingChangesInContingentConsideration
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information about the contingent consideration compensation expense. + References No definition available. + Details
Name: | cigi_ContingentConsiderationCompensationExpense
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents information about the contingent consideration fair value adjustments. + References No definition available. + Details
Name: | cigi_ContingentConsiderationFairValueAdjustments
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration