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Note 19 - Capital Stock - Capital Stock Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Capital Shares, Number (in shares) | 47,549,376 | 42,933,156
Capital Shares, Amount | $ 1,127,034 | $ 845,680
Subordinate Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 46,223,682 | 41,607,462
Capital Shares, Amount | $ 1,126,661 | $ 845,307
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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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |