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Note 19 - Capital Stock - Capital Stock Issued and Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Capital Shares, Number (in shares)	40,189,436	39,845,211
Capital Shares, Amount	$ 457,993	$ 442,153
Subordinate Voting Shares [Member]
Capital Shares, Number (in shares)	38,863,742	38,519,517
Capital Shares, Amount	$ 457,620	$ 441,780
Multiple Voting Shares [Member]
Capital Shares, Number (in shares)	1,325,694	1,325,694
Capital Shares, Amount	$ 373	$ 373

X

- Definition

Represents the value of the capital stock issued and outstanding.

+ References

No definition available.

+ Details

Name:	cigi_CaptialStockIssuedAndOutstandingValue
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_SharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=cigi_SubordinateVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=cigi_MultipleVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: