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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, 2022
Mar. 31, 2021
Basic Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 392,297 $ 266,202
Weighted average shares outstanding for basic income per share (in shares) 331,925,104 335,860,494
Basic income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.18 $ 0.79
Diluted Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 392,297 $ 266,202
Weighted average shares outstanding for basic income per share (in shares) 331,925,104 335,860,494
Dilutive effect of contingently issuable shares (in shares) 5,215,221 3,720,010
Weighted average shares outstanding for diluted income per share (in shares) 337,140,325 339,580,504
Diluted income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 1.16 $ 0.78