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Employee Benefit Plans - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 15, 2017 shares | Dec. 01, 2017 shares | May 17, 2019 shares | Dec. 31, 2019 USD ($) Pension_Plan shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | May 19, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Defined benefit plan | $ |  |  |  | $ 309,400,000 | $ 363,600,000 | $ 286,500,000 |
Plan name |  |  |  | CBRE 401(k) Plan |  |  |
Defined Contribution Plan, Sponsor Location [Extensible List] |  |  |  | us-gaap:DomesticPlanMember |  |  |
Company contribution percent per year employed |  |  |  | 20.00% |  |  |
Percent of annual compensation match percentage |  |  |  |  | 50.00% | 50.00% |
Percent of annual compensation to be matched |  |  |  |  | 6.00% | 6.00% |
Defined benefit plan, annual compensation expense maximum | $ |  |  |  |  | $ 150,000 | $ 150,000 |
Defined contribution plan, expenses recognized | $ |  |  |  | $ 59,900,000 | 46,300,000 | $ 38,800,000 |
Percent of 401(k) that can be invested in common stock |  |  |  | 25.00% |  |  |
Number of share held as investment under 401(k) Plan |  |  |  | 1,300,000 |  |  |
Defined Benefit Plan, Type [Extensible List] |  |  |  | us-gaap:PensionPlansDefinedBenefitMember |  |  |
Defined Benefit Plan, Sponsor Location [Extensible List] |  |  |  | us-gaap:ForeignPlanMember |  |  |
Number of contributory defined benefit pension plans in the United Kingdom | Pension_Plan |  |  |  | 2 |  |  |
Fair value of plan assets | $ |  |  |  | $ 331,400,000 | 274,400,000 |  |
Benefit obligation | $ |  |  |  | 439,400,000 | 387,400,000 |  |
Funded status | $ |  |  |  | 108,000,000.0 | 113,000,000.0 |  |
Unamortized actuarial loss | $ |  |  |  | $ 191,600,000 | $ 192,700,000 |  |
Annual Base Salary of Less than $100,000 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percent of annual compensation match percentage |  |  |  | 67.00% |  |  |
Percent of annual compensation to be matched |  |  |  | 6.00% |  |  |
Defined benefit plan, annual compensation expense maximum | $ |  |  |  | $ 100,000 |  |  |
Annual Base Salary of $100,000 or Up to $150,000 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percent of annual compensation match percentage |  |  |  | 50.00% |  |  |
Percent of annual compensation to be matched |  |  |  | 6.00% |  |  |
Defined benefit plan, annual compensation expense minimum | $ |  |  |  | $ 100,000,000 |  |  |
Defined benefit plan, annual compensation expense maximum | $ |  |  |  | $ 150,000 |  |  |
Time Based Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Time-vesting awards, portion to be vested per year |  |  |  | 25.00% |  |  |
Vesting period |  |  |  | 4 years |  |  |
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Employee subscription rate |  |  |  | 75.00% |  |  |
Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Employee subscription rate |  |  |  | 1.00% |  |  |
Restricted Stock Units [Member] | Time Based Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 1,493,788 | 1,332,085 | 1,466,986 |
Restricted Stock Units [Member] | Time Based Vesting [Member] | Senior Brokers [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |
Granted, Shares / Units | 127,160 |  |  |  |  |  |
Restricted Stock Units [Member] | Maximum [Member] | Performance Based Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 888,726 | 1,014,269 | 1,458,033 |
Non-Vested Stock Awards [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted, Shares / Units |  |  |  | 2,000,977 | 2,023,266 | 5,152,082 |
Stock options, compensation expense | $ |  |  |  | $ 127,700,000 | $ 128,200,000 | $ 93,100,000 |
Stock options, unrecognized estimated compensation cost | $ |  |  |  | $ 173,800,000 |  |  |
Weighted average period of recognition |  |  |  | 2 years 10 months 24 days |  |  |
2017 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unissued common stock available for issuance |  |  |  |  |  |  | 0
Shares granted in period under equity incentive plan |  |  | 189,499 |  |  |  |
Shares cancelled under equity incentive plan |  |  |  | 234,242 |  |  |
2017 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of trading days required for purposes of measuring shareholder return based on average closing price of common stock immediately preceding grant date |  | 60 days |  |  |  |  |
2017 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | Time Based Vesting [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  | 939,605 |  | 55,973 | 55,973 |  |
Share based compensation arrangement by share based payment percentage of target restricted stock unit |  | 33.30% |  |  |  |  |
2017 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | Total Shareholder Return [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity incentive plan termination date |  | Dec. 01, 2023 |  |  |  |  |
Share based compensation arrangement by share based payment percentage of target restricted stock unit |  | 33.30% |  |  |  |  |
Share-based compensation arrangement by share-based payment award, measurement period |  | 6 years |  |  |  |  |
2017 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | EPS [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity incentive plan termination date |  | Dec. 31, 2023 |  |  |  |  |
Share based compensation arrangement by share based payment percentage of target restricted stock unit |  | 33.30% |  |  |  |  |
Share-based compensation arrangement by share-based payment award, measurement period |  | 6 years |  |  |  |  |
2017 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | Maximum [Member] | Performance Based Vesting [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  | 3,288,618 |  | 195,907 | 195,907 |  |
2012 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 2,166,537 |  |  |
2019 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unissued common stock available for issuance |  |  |  |  |  |  | 0
Equity incentive plan termination date |  |  |  | Mar. 01, 2029 |  |  |
2019 Equity Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 7,538,712 |  |  |
Class A Common Stock [Member] | 2017 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance |  |  |  | 5,736,560 |  |  |
Class A Common Stock [Member] | 2019 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 9,944,743 |  |  |
Shares reserved for future issuance |  |  | 9,900,000 |  |  |  |

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