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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
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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

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- 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

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- 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

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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