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Note 11 - Intangible Assets - Acquired Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Estimated weighted average amortization period (Year)	8 years 36 days
Intangible assets, acquired	$ 198,333
Customer Lists and Relationships [Member]
Finite life intangible assets, acquired	$ 52,193
Estimated weighted average amortization period (Year)	9 years 292 days
Servicing Contracts [Member]
Finite life intangible assets, acquired	$ 99,900
Estimated weighted average amortization period (Year)	8 years 73 days
Trademarks and Trade Names [Member]
Finite life intangible assets, acquired	$ 3,500
Estimated weighted average amortization period (Year)	2 years
Brokerage Backlog [Member]
Finite life intangible assets, acquired	$ 8,740
Estimated weighted average amortization period (Year)	255 days
Other Intangible Assets [Member]
Finite life intangible assets, acquired	$ 4,800
Estimated weighted average amortization period (Year)	4 years 219 days
Licensing Agreements [Member]
Licenses - indefinite life	$ 29,200

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance, from an acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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X

- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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