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Income Per Share Information - Calculation of Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic Income Per Share                      
Net income attributable to CBRE Group, Inc. stockholders $ 313,765 $ 184,132 $ 81,897 $ 172,195 $ 637,618 $ 256,599 $ 223,731 $ 164,409 $ 751,989 $ 1,282,357 $ 1,063,219
Weighted average shares outstanding for basic income per share (in shares) 335,397,942 335,287,245 335,126,126 334,969,826 334,745,003 336,203,747 336,222,471 336,020,431 335,196,296 335,795,654 339,321,056
Basic income per share attributable to CBRE Group, Inc. shareholders (in USD per share) $ 0.94 $ 0.55 $ 0.24 $ 0.51 $ 1.90 $ 0.76 $ 0.67 $ 0.49 $ 2.24 $ 3.82 $ 3.13
Diluted Income Per Share                      
Net income attributable to CBRE Group, Inc. stockholders $ 313,765 $ 184,132 $ 81,897 $ 172,195 $ 637,618 $ 256,599 $ 223,731 $ 164,409 $ 751,989 $ 1,282,357 $ 1,063,219
Weighted average shares outstanding for basic income per share (in shares) 335,397,942 335,287,245 335,126,126 334,969,826 334,745,003 336,203,747 336,222,471 336,020,431 335,196,296 335,795,654 339,321,056
Dilutive effect of contingently issuable shares (in shares)                 3,195,914 4,727,217 3,801,293
Dilutive effect of stock options (in shares)                 0 0 392
Weighted average shares outstanding for diluted income per share (in shares) 338,799,615 337,665,848 337,361,419 339,737,911 340,333,005 341,100,182 340,508,931 340,158,399 338,392,210 340,522,871 343,122,741
Diluted income per share attributable to CBRE Group, Inc. shareholders (in USD per share) $ 0.93 $ 0.55 $ 0.24 $ 0.51 $ 1.87 $ 0.75 $ 0.66 $ 0.48 $ 2.22 $ 3.77 $ 3.10