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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Parenthetical) (Detail) - Warehouse Agreement Borrowings [Member] - Subsequent Event [Member] - Capital One [Member] - Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member | Jul. 27, 2017
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Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |
Current Maturity | Jul. 27, 2018
Line of credit over LIBOR rate | 1.40%

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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Namespace Prefix: | cbg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=cbg_CapitalOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |