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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |
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Jan. 18, 2021 | Sep. 25, 2020 | Jul. 24, 2020 | Dec. 31, 2020 | Dec. 01, 2020 | Oct. 19, 2020 | Sep. 22, 2020 | Sep. 21, 2020 | Aug. 04, 2020 | Jul. 01, 2020 | Jun. 10, 2020 | Dec. 31, 2019 | Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  | $ 1,383,964,000 |  |  |  |  |  |  |  | $ 977,175,000 |
Warehouse Agreement Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | 3,500,000,000 |  |  |  |  |  |  |  | 3,400,000,000 |
Carrying Value |  |  |  | $ 1,383,964,000 |  |  |  |  |  |  |  | 977,175,000 |
Warehouse Agreement Borrowings | JP Morgan | Pricing at daily one-month LIBOR plus 1.30%, maturing October 18, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Oct. 18, 2021 |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  | 1.60% |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 1,585,000,000 | $ 2,085,000,000.0 | $ 1,585,000,000.0 |  |  |  |  |  | 985,000,000 |
Carrying Value |  |  |  | $ 561,726,000 |  |  |  |  |  |  |  | 267,075,000 |
Warehouse Agreement Borrowings | JP Morgan | Pricing at daily one-month LIBOR plus 1.30%, maturing October 18, 2021 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate | 1.60% |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size | $ 985,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Agreement Borrowings | JP Morgan | Pricing at daily one-month LIBOR plus 2.75%, maturing October 18, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Oct. 18, 2021 |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  | 2.75% |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  | 15,000,000 |
Warehouse Agreement Borrowings | Capital One | Warehouse Line Of Credit Three |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | 0 |  |  |  |  |  |  |  | 200,000,000 |
Carrying Value |  |  |  | $ 0 |  |  |  |  |  |  |  | 39,538,000 |
Warehouse Agreement Borrowings | Fannie Mae ASAP Program |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Cancelableanytime |  |  |  |  |  |  |  |  |
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Pricing at daily one-month LIBOR plus 1.45%, with a LIBOR floor of 0.25%, Cancelable anytime |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  | 1.45% |  |  |  |  |  |  |  |  |
Line of credit, LIBOR floor rate |  | 0.25% |  | 0.25% |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  | 450,000,000 |
Carrying Value |  |  |  | $ 132,692,000 |  |  |  |  |  |  |  | 360,784,000 |
Interest rate increase (decrease) |  | 1000.00% |  |  |  |  |  |  |  |  |  |  |
Warehouse Agreement Borrowings | T D Bank | Pricing 2-business day prior LIBOR plus 1.15%, maturing June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Jun. 30, 2021 |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  | 1.15% |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 800,000,000 |  |  |  |  |  | $ 400,000,000.0 |  | 800,000,000 |
Carrying Value |  |  |  | $ 401,849,000 |  |  |  |  |  |  |  | 92,266,000 |
Line of credit utilized |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |
Warehouse Agreement Borrowings | T D Bank | Warehouse Line Of Credit Five, temporary, uncommitted |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |
Warehouse Agreement Borrowings | Bank Of America | Pricing at (i) daily floating rate LIBOR plus 1.40%, with a LIBOR floor of 0.25% on the general facility (ii) daily floating rate LIBOR pluc 1.75% on sublimit borrowing, maturing May 26, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | May 26, 2021 |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 | 350,000,000 |
Carrying Value |  |  |  | $ 175,862,000 |  |  |  |  |  |  |  | 189,465,000 |
Warehouse Agreement Borrowings | Bank Of America | Pricing at (i) daily floating rate LIBOR plus 1.40%, with a LIBOR floor of 0.25% on the general facility (ii) daily floating rate LIBOR pluc 1.75% on sublimit borrowing, maturing May 26, 2021 | General Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  | 1.40% |  |  |  |  |  |  |  |  |  |
Line of credit, LIBOR floor rate |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Warehouse Agreement Borrowings | Bank Of America | Pricing at (i) daily floating rate LIBOR plus 1.40%, with a LIBOR floor of 0.25% on the general facility (ii) daily floating rate LIBOR pluc 1.75% on sublimit borrowing, maturing May 26, 2021 | Sublimit Borrowing Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |
Warehouse Agreement Borrowings | Bank Of America | Warehouse Line Of Credit Seven |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | 0 |  |  |  |  |  |  |  | 250,000,000 |
Carrying Value |  |  |  | $ 0 |  |  |  |  |  |  |  | 17,457,000 |
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | Pricing at daily floating rate LIBOR plus 1.50%, maturing June 28, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current Maturity |  |  |  | Jun. 28, 2021 |  |  |  |  |  |  |  |  |
Line of credit over LIBOR rate |  |  |  | 1.50% |  |  |  |  |  |  |  |  |
Line of credit, LIBOR floor rate |  |  |  | 0.25% |  |  |  |  |  |  |  |  |
Maximum Facility Size |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  | 350,000,000 | $ 200,000,000.0
Carrying Value |  |  |  | $ 111,835,000 |  |  |  |  |  |  |  | $ 10,590,000 |
Additional line of credit |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  | $ 150,000,000.0
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | Pricing at daily floating rate LIBOR plus 1.50%, maturing June 28, 2021 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit utilized |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |

X
- Definition Additional line of credit. + References No definition available. + Details
Name: | cbre_AdditionalLineOfCredit
Namespace Prefix: | cbre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of credit facility expiration term. + References No definition available. + Details
Name: | cbre_LineOfCreditFacilityExpirationTerm
Namespace Prefix: | cbre_
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: | cbre_LineOfCreditLondonInterBankOfferRateFloor
Namespace Prefix: | cbre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
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Namespace Prefix: | cbre_
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 Incremental percentage increase (decrease) in the stated rate on a 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

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=120391452&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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- 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=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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=120398452&loc=d3e534808-122878 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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=120398452&loc=d3e534808-122878 + Details
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Namespace Prefix: |
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