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Income Per Share and Stockholders' Equity - Calculations of Basic and Diluted Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 184,132 $ 256,599 $ 438,224 $ 644,739
Weighted average shares outstanding for basic income per share 335,287,245 336,203,747 335,128,531 336,149,719
Basic income per share attributable to CBRE Group, Inc. shareholders $ 0.55 $ 0.76 $ 1.31 $ 1.92
Diluted Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 184,132 $ 256,599 $ 438,224 $ 644,739
Weighted average shares outstanding for basic income per share 335,287,245 336,203,747 335,128,531 336,149,719
Dilutive effect of contingently issuable shares 2,378,603 4,896,435 3,127,328 4,440,288
Weighted average shares outstanding for diluted income per share 337,665,848 341,100,182 338,255,859 340,590,007
Diluted income per share attributable to CBRE Group, Inc. shareholders $ 0.55 $ 0.75 $ 1.30 $ 1.89