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Note 25 - Financial Instruments (Details Textual) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2018	Apr. 30, 2017
Contingent Consideration Liability [Member]
Fair Value Inputs, Weighted Average Discount Rate Increase	2.00%
Reduction in Fair Value of Contingent Consideration Liability	$ 3.4
Measurement Input, Discount Rate [Member]
Servicing Asset, Measurement Input	0.115
Measurement Input, Discount Rate [Member] | Minimum [Member]
Servicing Asset, Measurement Input	0.025
Business Combination, Contingent Consideration, Liability, Measurement Input	0.021
Measurement Input, Discount Rate [Member] | Maximum [Member]
Servicing Asset, Measurement Input	0.05
Business Combination, Contingent Consideration, Liability, Measurement Input	0.095
Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.046
Interest Rate Swap [Member]
Derivative Asset, Notional Amount		$ 100.0	$ 100.0
Derivative, Fixed Interest Rate		2.7205%	1.897%

X

- Definition

Increase in the weighted average interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	cigi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of contingent consideration liability reduced by increase in the weighted average discount rate.

+ References

No definition available.

+ Details

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X

- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Value of input used to measure servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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X

- Details

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- Details

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- Details

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