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Note 5 - Real Estate Assets Held for Sale (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Real Estate Portfolio [Member] |  |
Income, Real Estate Assets Held for Sale | $ 2,396 | $ 195
Minimum [Member] |  |
Limited Partner Equity Interest in Real Estate Portfolio | 1.00% |
Maximum [Member] |  |
Limited Partner Equity Interest in Real Estate Portfolio | 2.00% |

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 limited partner equity interest in real estate portfolio percent. + References No definition available. + Details
Name: | cigi_LimitedPartnerEquityInterestInRealEstatePortfolio
Namespace Prefix: | cigi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |