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Note 23 - Other Supplemental Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Other Supplement Information [Table Text Block] |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Cash payments made during the year |  |  |  |  |  |  |  |
Income tax, net of refunds |  | $ | 116,873 |  |  | $ | 46,492 |
Interest |  |  | 28,003 |  |  |  | 29,148 |
Non-cash financing activities |  |  |  |  |  |  |  |
Dividends declared but not paid |  |  | 6,608 |  |  |  | 2,009 |

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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