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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
Mar. 31, 2021
Mar. 31, 2020
Basic Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 266,202 $ 172,195
Weighted average shares outstanding for basic income per share (in shares) 335,860,494 334,969,826
Basic income per share attributable to CBRE Group, Inc. shareholders (in dollars per share) $ 0.79 $ 0.51
Diluted Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 266,202 $ 172,195
Weighted average shares outstanding for basic income per share (in shares) 335,860,494 334,969,826
Dilutive effect of contingently issuable shares (in shares) 3,720,010 4,768,085
Weighted average shares outstanding for diluted income per share (in shares) 339,580,504 339,737,911
Diluted income per share attributable to CBRE Group, Inc. shareholders (in dollars per share) $ 0.78 $ 0.51