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Variable Interest Entities (VIEs) - Schedule of Maximum Exposure to Loss (Detail) - Non-Consolidated Variable Interest Entities [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries	$ 23,996	$ 26,273
Co-investment commitments	22,262	2,364
Other current assets	3,715	3,401
Maximum exposure to loss	$ 49,973	$ 32,038

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- Definition

Variable interest entity entity maximum loss exposure amount commitments to investment in future real estate investment.

+ References

No definition available.

+ Details

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- Definition

Variable interest entity entity maximum loss exposure amount investments in affiliates subsidiaries associates and joint ventures.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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- Definition

Variable interest entity entity maximum loss exposure amount other current assets.

+ References

No definition available.

+ Details

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

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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