v3.26.1
Fair Value Measurements (Details) - EBP 001 - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 4,873,865 $ 4,291,955
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 677,644 1,877,900
Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,229  
CBRE Unitized Stock Fund, Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 910  
CBRE Unitized Stock Fund, CBRE Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 143,837 $ 129,861
EBP, Net Asset Value per Share or Unit $ 160.79 $ 131.29
EBP, Investment, Number of Shares 894,566 975,117
EBP, Investment, Excluding Plan Interest in Master Trust, Cost $ 34,600 $ 36,900
Separately managed accounts, common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 130,060  
Separately managed accounts, mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,454  
Participant-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 19,731  
Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 3,899,000 2,284,194
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 974,865 2,007,761
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 677,644 1,877,900
Level 1 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,229  
Level 1 | CBRE Unitized Stock Fund, Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 910  
Level 1 | CBRE Unitized Stock Fund, CBRE Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 143,837 129,861
Level 1 | Separately managed accounts, common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 130,060  
Level 1 | Separately managed accounts, mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,454  
Level 1 | Participant-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 19,731  
Level 1 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 3,899,000 2,284,194
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 2 | CBRE Unitized Stock Fund, Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 2 | CBRE Unitized Stock Fund, CBRE Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Separately managed accounts, common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 2 | Separately managed accounts, mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 2 | Participant-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 2 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 3,899,000 2,284,194
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 3 | CBRE Unitized Stock Fund, Money market fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 3 | CBRE Unitized Stock Fund, CBRE Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Separately managed accounts, common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 3 | Separately managed accounts, mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 3 | Participant-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0  
Level 3 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 0 $ 0