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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic Income Per Share        
Net income attributable to CBRE Group, Inc. stockholders $ 442,637 $ 81,897 $ 708,839 $ 254,092
Weighted average shares outstanding for basic income per share (in shares) 335,643,233 335,126,126 335,751,530 335,048,115
Basic income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.32 $ 0.24 $ 2.11 $ 0.76
Diluted Income Per Share        
Net income attributable to CBRE Group, Inc. stockholders $ 442,637 $ 81,897 $ 708,839 $ 254,092
Weighted average shares outstanding for basic income per share (in shares) 335,643,233 335,126,126 335,751,530 335,048,115
Dilutive effect of contingently issuable shares (in shares) 3,859,638 2,235,293 3,789,824 3,501,690
Weighted average shares outstanding for diluted income per share (in shares) 339,502,871 337,361,419 339,541,354 338,549,805
Diluted income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.30 $ 0.24 $ 2.09 $ 0.75