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Note 14 - Variable Interest Entities (Details Textual)	Dec. 31, 2019
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

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: