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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic Income Per Share        
Net income attributable to CBRE Group, Inc. stockholders $ 435,743 $ 184,132 $ 1,144,582 $ 438,224
Weighted average shares outstanding for basic income per share (in shares) 335,364,942 335,287,245 335,621,337 335,128,531
Basic (loss) income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.30 $ 0.55 $ 3.41 $ 1.31
Diluted Income Per Share        
Net income attributable to CBRE Group, Inc. stockholders $ 435,743 $ 184,132 $ 1,144,582 $ 438,224
Weighted average shares outstanding for basic income per share (in shares) 335,364,942 335,287,245 335,621,337 335,128,531
Dilutive effect of contingently issuable shares (in shares) 4,972,217 2,378,603 4,183,955 3,127,328
Weighted average shares outstanding for diluted income per share (in shares) 340,337,159 337,665,848 339,805,292 338,255,859
Diluted income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.28 $ 0.55 $ 3.37 $ 1.30