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Leases - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
Maximum [Member]
Lease Cost [Line Items]
Lessee, lease term extension period	10 years

X

- Definition

Lease cost.

+ References

No definition available.

+ Details

Name:	cbre_LeaseCostLineItems
Namespace Prefix:	cbre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee operating and financing lease term extension period.

+ References

No definition available.

+ Details

Name:	cbre_LesseeOperatingAndFinancingLeaseTermExtensionPeriod
Namespace Prefix:	cbre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: