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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: