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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | $ 75,200,000 |
Accrued loan loss | 35,500,000 | $ 32,900,000
Assets available for recourse | 717,600,000 |
Warehouse receivables | $ 471,900,000 |
Letters of credit expiration date | 2019-09 |
Guarantees total | $ 55,700,000 |
Commitments to investment in future real estate investment | 51,700,000 |
Commitments to investment in unconsolidated real estate subsidiary | $ 23,600,000 |
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Co-investments typically range | 2.00% |
Funded loans subject to loss sharing arrangements [Member] |  |
Loss Contingencies [Line Items] |  |
Funded loans unpaid principal | $ 22,400,000,000 |
Letters of credit outstanding | 64,000,000 | 58,000,000
SBL Program [Member] |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | 5,000,000 | $ 5,000,000
Funded loans not subject to loss sharing arrangements [Member] |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding | $ 69,000,000 |

X
- Definition Assets available for recourse under the Fannie Mae DUS lender program. + References No definition available. + Details
Name: | cbg_AssetsAvailableForRecourse
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The reporting entity's aggregate commitments to fund future co-investments with its clients in certain real estate investments. + References No definition available. + Details
Name: | cbg_CommitmentsToInvestmentInFutureRealEstateInvestment
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The reporting entity's aggregate commitments to fund additional capital to certain unconsolidated real estate subsidiaries. + References No definition available. + Details
Name: | cbg_CommitmentsToInvestmentInUnconsolidatedEntity
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Principal amount outstanding as of the balance-sheet date of loans funded as part of a loss sharing arrangement with a third party. + References No definition available. + Details
Name: | cbg_FundedLoanPrincipalAmountOutstanding
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the reporting entity could be required to make excluding (1) those for which the reporting entity has an outstanding liability already accrued on its consolidated statement of financial position and (2) completion and budget guarantees relating to the reporting entity's Development Services segment. + References No definition available. + Details
Name: | cbg_GuarantorObligationsMaximumExposureUndiscounted
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects when the latest date in which the reporting entity's credit facilities terminate, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + References No definition available. + Details
Name: | cbg_LineOfCreditFacilityLatestExpirationDate
Namespace Prefix: | cbg_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reporting entity's estimate of loss sharing reserves on loans originated that are subject to a loss sharing arrangement with a third party. + References No definition available. + Details
Name: | cbg_LoanLossSharingReserve
Namespace Prefix: | cbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of equity in real estate investment. + References No definition available. + Details
Name: | cbg_PercentageOfEquityInRealEstateInvestment
Namespace Prefix: | cbg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before allowance of revolving credit lines for to originate and purchase financial assets including, but not limited to, mortgage loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_LoansReceivableMortgageWarehouseLending
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_
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Balance Type: | na
Period Type: | duration

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- Details
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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_DebtInstrumentAxis=cbg_MultifamilySmallBalanceLoanProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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