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FacilitySource Acquisition - Certain Adjustments to Unaudited Pro Forma Results (Detail) - FacilitySource [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Depreciation expense | $ 1,201 | $ 1,235 | $ 2,642 | $ 2,469
Amortization expense | 1,731 | 2,078 | 3,809 | 4,155
Interest expense | $ 1,224 | $ 1,525 | $ 2,748 | $ 3,049

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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- Definition Business acquisitions, incremental depreciation expense. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- 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

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