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Note 21 - Other Supplemental Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Notes Tables |
Schedule of Other Supplement Information [Table Text Block] |
|  | Year ended December 31, |
|  | 2024 |  |  | 2023 |
Cash payments made during the year |  |  |  |  |  |  |  |
Income tax, net of refunds |  | $ | 70,345 |  |  | $ | 118,175 |
Interest |  |  | 89,926 |  |  |  | 96,203 |
Non-cash financing activities |  |  |  |  |  |  |  |
Dividends declared but not paid |  |  | 7,592 |  |  |  | 7,132 |

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- Definition The tabular disclosure of the schedule of other supplement information. + References No definition available. + Details
Name: | cigi_ScheduleOfOtherSupplementInformationTableTextBlock
Namespace Prefix: | cigi_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration