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Note 4 - Real Estate Assets Held for Sale - Real Estate Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Real estate assets held for sale (note 4) - current	$ 10,741
Real estate assets held for sale (note 4) - noncurrent	247,376
Total real estate assets held for sale	258,117
Liabilities related to real estate assets held for sale - current	(36,191)
Liabilities related to real estate assets held for sale - non-current	(127,703)
Total liabilities related to real estate assets held for sale	(163,894)
Total net real estate assets held for sale	$ 94,223

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold after a year or the normal operating cycle.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of liabilities held-for-sale, not part of disposal group.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of liabilities held-for-sale, not part of disposal group,classified as current.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of liabilities held-for-sale, not part of disposal group, classified as noncurrent.

+ References

No definition available.

+ Details

Name:	cigi_LiabilitiesHeldforsaleNotPartOfDisposalGroupNoncurrentTotal
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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