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Note 5 - Warehouse Fund Assets (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Number of Assets Sold | 3 |
Number of Assets Held for Sale, Acquired Previous Year | 2 |
Real Estate Portfolio [Member] |  |
Income, Real Estate Assets Held for Sale | $ 0 | $ 0
Land Asset [Member] |  |
Number of Assets Acquired | 1 |
Direct Lending Credit Investments [Member] |  |
Number of Assets Acquired | 3 |

X
- Definition The amount of income from real estate assets held for sale. + References No definition available. + Details
Name: | cigi_IncomeRealEstateAssetsHeldForSale
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of assets acquired. + References No definition available. + Details
Name: | cigi_NumberOfAssetsAcquired
Namespace Prefix: | cigi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of assets held for sale that were acquired the previous year. + References No definition available. + Details
Name: | cigi_NumberOfAssetsHeldForSaleAcquiredPreviousYear
Namespace Prefix: | cigi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of assets sold. + References No definition available. + Details
Name: | cigi_NumberOfAssetsSold
Namespace Prefix: | cigi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cigi_RealEstatePortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetAcquisitionAxis=cigi_LandAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetAcquisitionAxis=cigi_DirectLendingCreditInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |