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Long-Term Debt and Short-Term Borrowings - Long-Term Debt - Additional Information (Detail) - USD ($)		6 Months Ended
	Mar. 31, 2016	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Minimum coverage ratio of EBITDA to total interest expense expressed in percentage		200.00%
Maximum leverage ratio of total debt less available cash to EBITDA expressed in percentage		425.00%
Coverage ratio of EBITDA to total interest expense expressed in percentage		1370.00%
Leverage ratio of total debt less available cash to EBITDA expressed in percentage		124.00%
2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts available to borrow under Credit Agreement		$ 2,800,000,000
Revolving credit facility maturity date		Mar. 21, 2021
5.00% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		5.00%	5.00%
5.00% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		5.00%	5.00%
4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		4.875%	4.875%
4.875% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		4.875%	4.875%
5.25% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		5.25%	5.25%
5.25% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate of long-term debt		5.25%	5.25%
Revolving credit facility [Member] | 2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility increase in borrowing capacity	$ 200,000,000
Tranche A term loan facility [Member] | 2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts available to borrow under Credit Agreement		$ 500,000,000
Revolving credit facility maturity date		Jan. 09, 2020
Tranche B-1 term loan facility [Member] | 2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts available to borrow under Credit Agreement		$ 270,000,000
Revolving credit facility maturity date		Sep. 03, 2020
Tranche B-2 term loan facility [Member] | 2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts available to borrow under Credit Agreement		$ 130,000,000
Revolving credit facility maturity date		Sep. 03, 2022

X

- Definition

Ratio of EBITDA as defined in the Credit Agreement to interest expense calculated over a trailing twelve month period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Leverage ratio of total debt to EBITDA.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the maximum ratio of debt less available cash to earnings before interest, taxes, depreciation and amortization (EBITDA) allowed in the reporting entity's credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbg_
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Period Type:	duration

X

- Definition

This element represents the minimum ratio of earnings before interest, taxes, depreciation and amortization (EBITDA) to total interest expense required in the reporting entity's credit agreement.

+ References

No definition available.

+ Details

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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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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X

- 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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X

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Balance Type:	credit
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://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

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X

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- Details

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- Details

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- Details

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- Details

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