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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Parenthetical) (Detail)	Oct. 23, 2017
Warehouse Agreement Borrowings [Member] | Subsequent Event [Member] | JP Morgan [Member] | Maturing on October 22, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Oct. 22, 2018

X

- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

+ Details

Name:	cbg_WarehouseReceivablesAndWarehouseLinesOfCreditLineItems
Namespace Prefix:	cbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditTwelveMember
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