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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019
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New Accounting Pronouncement Early Adoption [Line Items] |  |
Lease liability | $ 1,214,028 |
Right-of-use assets | $ 998,319 |
Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |
Lease liability |  | $ 1,200,000
Right-of-use assets |  | $ 1,000,000

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- Definition Operating and finance lease liability + References No definition available. + Details
Name: | cbre_OperatingAndFinanceLeaseLiability
Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating and finance lease right of use asset. + References No definition available. + Details
Name: | cbre_OperatingAndFinanceLeaseRightOfUseAsset
Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementEarlyAdoptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |