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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 ($)				12 Months Ended
	Oct. 21, 2019	Aug. 01, 2019	Jul. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2020	Feb. 06, 2020	Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 3,400,000,000	$ 2,600,000,000
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Oct. 19, 2020			Oct. 19, 2020
Maximum Facility Size				$ 985,000,000	$ 985,000,000
Line of credit over LIBOR rate				1.30%	1.30%
JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Oct. 19, 2020			Oct. 19, 2020
Maximum Facility Size				$ 15,000,000	$ 15,000,000
Line of credit over LIBOR rate				2.75%	2.75%
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]
Maximum Facility Size				$ 450,000,000	$ 450,000,000
Line of credit over LIBOR rate				1.35%	1.35%
Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] | Forecast [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size						$ 450,000,000.0
Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member] | Subsequent Event [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size							$ 600,000,000.0
TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity		Feb. 01, 2020	Jun. 30, 2020
Maximum Facility Size		$ 800,000,000.0
Line of credit over LIBOR rate			1.15%
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]
Current Maturity				Jun. 28, 2020
Maximum Facility Size				$ 350,000,000				$ 200,000,000.0
Line of credit over LIBOR rate				1.20%	1.20%
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

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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

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X

- Definition

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

+ References

No definition available.

+ Details

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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=6877327&loc=d3e13212-122682

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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

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