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Note 16 - Capital Stock (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2004 $ / shares	Dec. 31, 2019 $ / shares $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2019 USD ($)
Common Stock, Dividends, Per Share, Declared		$ 0.10	$ 0.10
Share Price		$ 101.10
Contingent Liabiilty upon Sale of Control | $				$ 310,579
Subordinate Voting Shares Conversion Rate [Member]
Payment Formula Base Price, Second Payment	$ 6.472
Chief Executive Officer [Member]
Percentage Payment of Shares Outstanding, First Payment	5.00%
Payment Formula Base Price, First Payment	$ 3.324
Percentage Payment of Shares Outstanding, Second Payment	5.00%
Subordinate Voting Shares [Member]
Number of Votes for Subordinate Voting Shares		1
Multiple Voting Shares [Member]
Number of Votes for Multiple Voting Shares		20

X

- Definition

Contingent liability upon arm's length sale of control of the Company.

+ References

No definition available.

+ Details

Name:	cigi_ContingentLiabiiltyUponSaleOfControl
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the number of votes for multiple voting shares.

+ References

No definition available.

+ Details

Name:	cigi_NumberOfVotesForMultipleVotingShares
Namespace Prefix:	cigi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of votes for the subordinate voting shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	cigi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the information pertaining to the payment formula base price for the first payment.

+ References

No definition available.

+ Details

Name:	cigi_PaymentFormulaBasePriceFirstPayment
Namespace Prefix:	cigi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the information pertaining to the payment formula base price for the second payment.

+ References

No definition available.

+ Details

Name:	cigi_PaymentFormulaBasePriceSecondPayment
Namespace Prefix:	cigi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the information pertaining to the percentage payment of share outstanding for the first payment.

+ References

No definition available.

+ Details

Name:	cigi_PercentagePaymentOfSharesOutstandingFirstPayment
Namespace Prefix:	cigi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the information pertaining to the percentage payment of shares outstanding for the second payment.

+ References

No definition available.

+ Details

Name:	cigi_PercentagePaymentOfSharesOutstandingSecondPayment
Namespace Prefix:	cigi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PreferredUnitsByNameAxis=cigi_SubordinateVotingSharesConversionRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=cigi_SubordinateVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: