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Note 18 - Other Supplemental Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Other Supplement Information [Table Text Block] |
|  |  | 2017 |  |  |  | 2016 |
Cash payments made during the period |  |  |  |  |  |  |  |
Income taxes, net of refunds |  | $ | 43,374 |  |  | $ | 36,349 |
Interest |  |  | 11,168 |  |  |  | 7,980 |
Non-cash financing activities |  |  |  |  |  |  |  |
Increases in capital lease obligations |  | $ | 123 |  |  | $ | 988 |
Dividends declared but not paid |  |  | 1,947 |  |  |  | 1,932 |
Other expenses |  |  |  |  |  |  |  |
Rent expense |  | $ | 65,982 |  |  | $ | 57,850 |

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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: | nonnum: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