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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($)								9 Months Ended	12 Months Ended
	Sep. 22, 2020	Sep. 21, 2020	Aug. 04, 2020	Jul. 28, 2020	Jul. 01, 2020	Jun. 26, 2020	Jun. 10, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Carrying Value								$ 1,191,834,000	$ 977,175,000
Warehouse Agreement Borrowings [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Jan. 20, 2021		Jun. 28, 2021
Maximum Facility Size	$ 100,000,000.0		$ 100,000,000.0					2,900,000,000	3,400,000,000
Carrying Value								$ 1,191,834,000	977,175,000
Line of credit over LIBOR rate			1.50%
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 1.30%, maturing October 19, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity								Oct. 19, 2020
Maximum Facility Size								$ 985,000,000	985,000,000
Carrying Value								$ 336,262,000	$ 267,075,000
Line of credit over LIBOR rate								1.30%	1.30%
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily floating rate LIBOR plus 2.75%, maturing October 19, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity								Oct. 19, 2020
Maximum Facility Size								$ 15,000,000	$ 15,000,000
Line of credit over LIBOR rate								2.75%	2.75%
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity								Jul. 27, 2020
Maximum Facility Size									$ 200,000,000
Carrying Value									$ 39,538,000
Line of credit over LIBOR rate								1.25%	1.25%
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity								Cancelable anytime
Maximum Facility Size								$ 450,000,000	$ 450,000,000
Carrying Value								$ 65,505,000	$ 360,784,000
Line of credit over LIBOR rate								1.35%	1.35%
Line of credit, LIBOR floor rate								0.35%	0.35%
Warehouse Agreement Borrowings [Member] | TD Bank [Member] | Pricing at daily floating rate LIBOR plus 1.15%, maturing June 30, 2021 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity		Dec. 31, 2020			Jun. 30, 2021
Maximum Facility Size					$ 400,000,000.0			$ 800,000,000	$ 800,000,000
Carrying Value								$ 596,021,000	$ 92,266,000
Line of credit over LIBOR rate								1.15%	1.15%
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | LIBOR daily floating rate plus 1.50% on general facility and LIBOR daily floating rate plus 1.75% on separate sublimit borrowing, maturing on May 26, 2021 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity							May 26, 2021	May 26, 2021
Maximum Facility Size							$ 350,000,000.0	$ 350,000,000	$ 350,000,000
Carrying Value								$ 189,290,000	189,465,000
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing May 27, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity								May 27, 2020
Maximum Facility Size									250,000,000
Carrying Value									$ 17,457,000
Line of credit over LIBOR rate								1.15%	1.15%
Warehouse Agreement Borrowings [Member] | MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily floating rate LIBOR plus 1.20%, maturing June 28, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity				Aug. 27, 2020		Jul. 28, 2020
Maximum Facility Size								$ 300,000,000	$ 350,000,000	$ 200,000,000.0
Carrying Value								$ 4,756,000	$ 10,590,000
Line of credit over LIBOR rate								1.50%	1.50%

X

- Definition

Line of credit facility expiration term.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the minimum amount for the debt instrument's basis spread over the variable interest rate on a debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ 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=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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=120391452&loc=d3e13212-122682

+ Details

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

X

- Definition

Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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X

- Details

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- Details

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