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Warehouse Receivables & Warehouse Lines of Credit - Additional Information (Detail) - Warehouse Agreement Borrowings [Member]	9 Months Ended
	Sep. 30, 2018 USD ($)
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Period of repayment for warehouse lines of credit	1 month
Lines of credit principal outstanding	$ 2,300,000,000

X

- Definition

Period of repayment for warehouse lines of credit.

+ References

No definition available.

+ Details

Name:	cbg_PeriodOfRepaymentForWarehouseLinesOfCredit
Namespace Prefix:	cbg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_WarehouseAgreementBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: