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v3.20.2

Segments - Adjusted EBITDA Calculation by Segment (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |
Costs primarily associated with workforce optimization efforts | $ 37,594 | $ 37,594
Cost of Revenue [Member] |  |
Segment Reporting Information [Line Items] |  |
Costs primarily associated with workforce optimization efforts | 7,400 | 7,400
Operating, Administrative, and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Costs primarily associated with workforce optimization efforts | $ 30,200 | $ 30,200

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- Definition costs primarily associated with workforce optimization efforts. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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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_IncomeStatementLocationAxis=cbre_OperatingAdministrativeAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |