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Note 26 - Commitments and Contingencies (Details Textual) - Loss Sharing Obligations [Member] $ in Thousands	Dec. 31, 2020 USD ($)
Unpaid Principal Balance of Funded and Sold Loans Subject to Loss Sharing Obligations	$ 4,000,000
Other Liabilities [Member]
Loss Contingency Accrual, Ending Balance	$ 15,194

X

- Definition

The amount of unpaid principal balance of funded and sold loans subject to loss sharing obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=cigi_LossSharingObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: