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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Feb. 01, 2018	Jan. 27, 2018	Jan. 09, 2018
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Carrying Value	$ 1,471,591,000	$ 910,766,000
Warehouse Agreement Borrowings [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	2,300,000,000	3,000,000,000
Carrying Value	$ 1,471,591,000	910,766,000
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.45%, maturing October 23, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Oct. 23, 2018
Maximum Facility Size	$ 1,000,000,000	1,000,000,000
Carrying Value	$ 725,150,000	$ 192,180,000
Line of credit over LIBOR rate	1.45%	1.45%
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 23, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Oct. 23, 2018
Maximum Facility Size	$ 25,000,000	$ 25,000,000
Carrying Value		$ 5,800,000
Line of credit over LIBOR rate	2.75%	2.75%
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Cancelable anytime
Maximum Facility Size	$ 450,000,000	$ 450,000,000
Carrying Value	$ 15,338,000	$ 205,827,000
Line of credit over LIBOR rate	1.35%	1.35%
Line of credit, LIBOR floor rate	0.35%	0.35%
Warehouse Agreement Borrowings [Member] | TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 30, 2019 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Jun. 30, 2019
Maximum Facility Size	$ 400,000,000	$ 800,000,000	$ 400,000,000
Carrying Value	$ 366,043,000	$ 225,416,000
Line of credit over LIBOR rate	1.20%	1.20%
Warehouse Agreement Borrowings [Member] | Bank of America (BofA) [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing September 4, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Sep. 04, 2018
Maximum Facility Size	$ 225,000,000	$ 337,500,000		$ 225,000,000
Carrying Value	$ 225,303,000	$ 130,443,000
Line of credit over LIBOR rate	1.40%	1.40%
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.40%, maturing July 27, 2018 [Member]
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Current Maturity	Jul. 27, 2018
Maximum Facility Size	$ 200,000,000	$ 387,500,000			$ 200,000,000
Carrying Value	$ 139,757,000	$ 151,100,000
Line of credit over LIBOR rate	1.40%	1.40%

X

- Definition

Line of credit facility expiration term.

+ References

No definition available.

+ Details

Name:	cbg_LineOfCreditFacilityExpirationTerm
Namespace Prefix:	cbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the minimum amount for the debt instrument's basis spread over the variable interest rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	cbg_LineOfCreditLondonInterBankOfferRateFloor
Namespace Prefix:	cbg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

+ Details

Name:	cbg_WarehouseReceivablesAndWarehouseLinesOfCreditLineItems
Namespace Prefix:	cbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

+ 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(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_WarehouseAgreementBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_WarehouseAgreementBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbg_JPMorganMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbg_FannieMaeASAPProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbg_TDBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbg_BankOfAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbg_WarehouseLineOfCreditSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: