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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | $ 104,400,000 |
Accrued loan loss | 56,500,000 | $ 37,000,000.0
Assets available for recourse | $ 928,000,000.0 |
Letters of credit expiration date | 2021-10 |
Guarantees total | $ 72,400,000 |
Commitments to investment in future real estate investment | 84,000,000.0 |
Commitments to investment in unconsolidated real estate subsidiary | $ 41,000,000.0 |
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Co-investments typically range | 2.00% |
COVID 19 Pandemic [Member] |  |
Loss Contingencies [Line Items] |  |
Advances for principal and interest | $ 5,200,000 |
Warehouse Receivable [Member] |  |
Loss Contingencies [Line Items] |  |
Warehouse receivables | 556,400,000 |
Funded loans subject to loss sharing arrangements [Member] |  |
Loss Contingencies [Line Items] |  |
Funded loans unpaid principal | 26,200,000,000 |
Letters of credit outstanding | 85,000,000.0 | 72,000,000.0
SBL Program [Member] |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | $ 5,000,000.0 | $ 5,000,000.0
Percentage of maximum original principal amount loan loss | 10.00% |
Funded loans not subject to loss sharing arrangements [Member] |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | $ 90,000,000.0 |

X
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Namespace Prefix: | cbre_
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Balance Type: | debit
Period Type: | instant

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- Definition Assets available for recourse under the Fannie Mae DUS lender program. + References No definition available. + Details
Name: | cbre_AssetsAvailableForRecourse
Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The reporting entity's aggregate commitments to fund future co-investments with its clients in certain real estate investments. + References No definition available. + Details
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Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The reporting entity's aggregate commitments to fund additional capital to certain unconsolidated real estate subsidiaries. + References No definition available. + Details
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Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Principal amount outstanding as of the balance-sheet date of loans funded as part of a loss sharing arrangement with a third party. + References No definition available. + Details
Name: | cbre_FundedLoanPrincipalAmountOutstanding
Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the reporting entity could be required to make excluding (1) those for which the reporting entity has an outstanding liability already accrued on its consolidated statement of financial position and (2) completion and budget guarantees relating to the reporting entity's Development Services segment. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Reflects when the latest date in which the reporting entity's credit facilities terminate, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + References No definition available. + Details
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Namespace Prefix: | cbre_
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Balance Type: | na
Period Type: | duration

X
- Definition The reporting entity's estimate of loss sharing reserves on loans originated that are subject to a loss sharing arrangement with a third party. + References No definition available. + Details
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Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
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Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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