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Note 3 - Acquisitions - Acquisitions Details (Details) (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Cash consideration, cash acquired |  | $ 23,777
Finland Residential Property Management Business [Member] |  |
Cash consideration, cash acquired | $ 4,765 |

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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_CashAcquiredFromAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=cigi_FinlandResidentialPropertyManagementBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |