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Note 19 - Other Supplemental Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Other Supplement Information [Table Text Block] |
|  | 2016 |  | 2015 |  | 2014
Cash payments made during the year |  |  |  |  |  |  |  |  |  |  |  |
Income taxes, net of refunds |  | $ | 36,349 |  |  | $ | 35,679 |  |  | $ | 34,904 |
Interest |  |  | 7,980 |  |  |  | 8,057 |  |  |  | 9,002 |
Non-cash financing activities |  |  |  |  |  |  |  |  |  |  |  |
Increases in capital lease obligations |  | $ | 988 |  |  | $ | 1,021 |  |  | $ | 2,581 |
Dividends declared but not paid |  |  | 1,932 |  |  |  | 1,540 |  |  |  | 3,581 |
Other expenses |  |  |  |  |  |  |  |  |  |  |  |
Rent expense |  | $ | 57,850 |  |  | $ | 52,561 |  |  | $ | 53,873 |

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

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