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Warehouse Receivables & Warehouse Lines of Credit - Warehouse Receivables Activity (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Warehouse Receivables Activity [Roll Forward]
Beginning balance	$ 1,303,717
Origination of mortgage loans	6,984,779	$ 7,578,056
Gains (premiums on loan sales)	23,563
Proceeds from sale of mortgage loans:
Sale of mortgage loans	(7,246,860)
Cash collections of premiums on loan sales	(23,563)
Proceeds from sale of mortgage loans	(7,270,423)	$ (7,902,512)
Net decrease in mortgage servicing rights included in warehouse receivables	(7,611)
Ending balance	$ 1,034,025

X

- Definition

Reflects the gross carrying amount of unpaid loans pertaining to a revolving line of credit used by mortgage bankers in which the mortgage banker originates and purchases mortgage loans due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	cbre_LoanReceivableMortgageWarehouseLendingCurrent
Namespace Prefix:	cbre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net increase (decrease) in mortgage servicing rights included in warehouse receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbre_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Sale of mortgage loans held for sale.

+ References

No definition available.

+ Details

Name:	cbre_SaleOfMortgageLoansHeldForSale
Namespace Prefix:	cbre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Warehouse Receivables Activity

+ References

No definition available.

+ Details

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

X

- Definition

Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash paid for the origination of mortgages that are held for sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3461-108585

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

X

- Definition

The cash inflow from collection of repayments from borrowers on loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3461-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3337-108585

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Balance Type:	debit
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X

- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3461-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585

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