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Note 7 - Acquisition-related Items (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Contingent Consideration Compensation Expense | $ 50,646 | $ 50,169
The 2023 Acquisitions [Member] |  |
Contingent Consideration Compensation Expense | $ 2,853 |

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
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cigi_The2023AcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |