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Note 26 - Commitments and Contingencies (Details Textual) - Loss Sharing Obligations [Member] $ in Thousands | Dec. 31, 2020 USD ($)
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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

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- Definition The amount of unpaid principal balance of funded and sold loans subject to loss sharing obligations. + References No definition available. + Details
Name: | cigi_UnpaidPrincipalBalanceOfFundedAndSoldLoansSubjectToLossSharingObligations
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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