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Note 17 - Variable Interest Entities (Details Textual) | Dec. 31, 2020
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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 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

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- 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: |