Statistical Measurement [Domain] Statistical Measurement [Domain] Exempt Party-In-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] CBRE Unitized Stock Fund, CBRE Common Stock EBP, Employer, Common Stock Fund [Member] Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] EBP, Description of Plan and Accounting Change [Abstract] Other deductions EBP, Change in Net Asset Available for Benefit, Decrease From Other Deductions EBP, Change in Net Asset Available for Benefit, Decrease From Other Deductions Investment Type [Axis] Investment Type [Axis] Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Other receivables EBP, Other Receivable EBP, Investment, Number of Shares EBP, Investment, Number of Shares Tax Status EBP, Tax Status [Text Block] Total Liabilities EBP, Liability EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Dividend and interest income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Participant Loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Net increase in net assets per Form 5500 EBP, Form 5500 Caption, Net Income (Loss) Accrued liabilities EBP, Accrued Expense Administration Expenses EBP, Administration Expenses [Text Block] EBP, Administration Expenses Money market funds Money Market Funds [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Automatic enrollment, period (in days) EBP, Participant Contribution, Automatic, Deferral Rate, Automatic Enrollment, Period EBP, Participant Contribution, Automatic, Deferral Rate, Automatic Enrollment, Period Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Payment of Benefits EBP, Payment to Participant [Policy Text Block] NET ASSETS AVAILABLE FOR BENEFITS Net assets available for benefits at beginning of year Net assets available for benefits at end of year Net assets available for benefits per the financial statements EBP, Net Asset Available for Benefit EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Employer Matching Contribution EBP, Employer Matching Contribution [Member] EBP, Employer Matching Contribution Total Assets EBP, Asset Maximum annual contribution to eligible compensation, amount EBP, Employer Contribution, Maximum Participant Compensation Matched, Amount EBP, Employer Contribution, Maximum Participant Compensation Matched, Amount EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Nonparticipant-Directed Investment [Table] EBP, Nonparticipant-Directed Investment [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Employer contribution vesting service period (in years) EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Total CBRE Unitized Stock Fund EBP, Employer, Common Stock [Member] Automatic, deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Total Separately Managed Accounts Separately Managed Accounts [Member] Separately Managed Accounts Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] EBP, Nonparticipant-Directed Investment [Abstract] NET INCREASE IN NET ASSETS BEFORE TRANSFERS Net increase in net assets per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] Maximum Maximum [Member] Employee deferral contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash ASSETS: EBP, Asset [Abstract] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Minimum Minimum [Member] EBP, Schedule of Asset Held for Investment [Abstract] Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] EBP, Net Asset Value per Share or Unit EBP, Net Asset Value per Share or Unit Entity [Domain] Entity [Domain] Revenue sharing plan fees EBP, ERISA Account, Revenue Sharing Plan Fees EBP, ERISA Account, Revenue Sharing Plan Fees Total Investments EBP, Asset Held for Investment Investment, Identifier [Axis] Investment, Identifier [Axis] Separately managed accounts, mutual funds EBP, Separately Managed Accounts, Mutual Funds [Member] EBP, Separately Managed Accounts, Mutual Funds Transfer in from Direct Line 401(k) Plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Non-Discrimination Testing EBP, Non-Discrimination Testing [Text Block] EBP, Non-Discrimination Testing EBP, Investment, Fair Value and NAV [Abstract] NET INCREASE IN NET ASSETS AFTER TRANSFERS NET INCREASE IN NET ASSETS AFTER TRANSFERS EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Transfers EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Transfers Employer contribution maximum percentage EBP, Employer Contribution, Matching Percentage Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Text Block [Abstract] Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Mutual funds Mutual Fund [Member] EBP, Description of Plan [Table] EBP, Description of Plan [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Amendment Flag Amendment Flag EBP 002 EBP 002 [Member] EBP 002 Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Common collective trusts Common Collective Trust [Member] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Total investments EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Plan Termination EBP, Plan Termination [Text Block] EBP, Nonparticipant-Directed Investment [Line Items] EBP, Nonparticipant-Directed Investment [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Revenue sharing account balance at the end of the period EBP, ERISA Account, Revenue Sharing Account Balance EBP, ERISA Account, Revenue Sharing Account Balance EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] EBP, Related Party and Party-in-Interest Transactions [Abstract] Forfeited balance EBP, Forfeited Nonvested Account EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Other additions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other Investment Income (Loss) EBP, Statement of Net Asset Available for Benefit [Abstract] Participant loans in default - deemed distributions EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Description of Plan EBP, Description of Plan [Text Block] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total additions, net EBP, Change in Net Asset Available for Benefit, Increase Employer aggregate contributions EBP, Employer Contribution, Participant Compensation, Aggregate Matching Contributions EBP, Employer Contribution, Participant Compensation, Aggregate Matching Contributions EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Entity Central Index Key Entity Central Index Key Interest rate, percent EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type Total investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity tax identification number Entity Tax Identification Number Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Plan number EBP, Plan Number Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeitures during period EBP, Forfeited Nonvested Account, Forfeitures During Period EBP, Forfeited Nonvested Account, Forfeitures During Period Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Revenue Sharing EBP, Revenue Sharing Policy [Policy Text Block] EBP, Revenue Sharing Policy EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Use of Estimates EBP, Use of Estimate [Policy Text Block] Revenue sharing plan administration expenses EBP, ERISA Account, Revenue Sharing Account Administration Expenses EBP, ERISA Account, Revenue Sharing Account Administration Expenses Annual vesting percent EBP, Employer Contribution Vesting Service, Annual Percent EBP, Employer Contribution Vesting Service, Annual Percent Statistical Measurement [Axis] Statistical Measurement [Axis] DEDUCTIONS: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Separately managed accounts, common stock EBP, Separately Managed Accounts, Common Stock [Member] EBP, Separately Managed Accounts, Common Stock Notes receivable from participants EBP, Note Receivable from Participant CBRE Unitized Stock Fund, Money market fund EBP, Employer, Mutual Funds [Member] EBP, Employer, Mutual Funds Level 2 Fair Value, Inputs, Level 2 [Member] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Table Text Block] Employer contribution vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age ADDITIONS: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Increase in participant loans in default - deemed distributions EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investments [Domain] Investments [Domain] EBP, Subsequent Event [Abstract] Participant-directed brokerage accounts EBP, Self-Directed Brokerage Account [Member] Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP 001 EBP 001 [Member] EBP 001 Level 1 Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name Subsequent Events EBP, Subsequent Event [Text Block] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Tax Status [Table] EBP, Tax Status [Table] EBP, Investment, Excluding Plan Interest in Master Trust, Cost EBP, Investment, Excluding Plan Interest in Master Trust, Cost LIABILITIES: EBP, Liability [Abstract] Revenue sharing amount including interest EBP, ERISA Account, Revenue Sharing Amount Including Interest EBP, ERISA Account, Revenue Sharing Amount Including Interest Employer contribution, participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage