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FacilitySource Acquisition - Certain Adjustments to Unaudited Pro Forma Results (Detail) - FacilitySource [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Depreciation expense | $ 1,253 | $ 3,054 | $ 3,298
Amortization expense | 1,019 | 2,190 | 2,190
Interest expense | $ 2,748 | $ 6,098 | $ 6,098

X
- Definition The amount of incremental amortization expense that would have been recognized for the period if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business acquisitions, incremental depreciation expense. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of incremental interest expense that would have been recognized for the period if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cbg_FacilitySourceHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |