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Note 17 - Capital Stock - Capital Stock Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Capital Shares, Number (in shares) | 50,610,676 | 47,549,376
Capital Shares, Amount | $ 1,472,218 | $ 1,127,034
Subordinate Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 49,284,982 | 46,223,682
Capital Shares, Amount | $ 1,471,845 | $ 1,126,661
Multiple Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 1,325,694 | 1,325,694
Capital Shares, Amount | $ 373 | $ 373

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- Definition Represents the value of the capital stock issued and outstanding. + References No definition available. + Details
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Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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