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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Parenthetical) (Detail) - Warehouse Agreement Borrowings [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 3,400,000,000	$ 3,400,000,000
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 350,000,000	$ 350,000,000	$ 200,000,000.0
MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member] | Maximum [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Additional line of credit			$ 150,000,000.0

X

- Definition

Additional line of credit.

+ References

No definition available.

+ Details

Name:	cbre_AdditionalLineOfCredit
Namespace Prefix:	cbre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbre_MUFGUnionBankNAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbre_WarehouseLineOfCreditNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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