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v3.19.3.a.u2

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: |