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FacilitySource Acquisition - Certain Adjustments to Unaudited Pro Forma Results (Detail) - FacilitySource [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |
Depreciation expense | $ 1,090 | $ 2,377 | $ 3,269
Amortization expense | 1,441 | 2,976 | 4,324
Interest expense | $ 1,525 | $ 2,769 | $ 4,574

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