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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, 2020
Mar. 31, 2019
Basic Income Per Share    
Net income attributable to CBRE Group, Inc. shareholders $ 172,195 $ 164,409
Weighted average shares outstanding for basic income per share 334,969,826 336,020,431
Basic income per share attributable to CBRE Group, Inc. shareholders $ 0.51 $ 0.49
Diluted Income Per Share    
Net income attributable to CBRE Group, Inc. shareholders $ 172,195 $ 164,409
Weighted average shares outstanding for basic income per share 334,969,826 336,020,431
Dilutive effect of contingently issuable shares 4,768,085 4,137,968
Weighted average shares outstanding for diluted income per share 339,737,911 340,158,399
Diluted income per share attributable to CBRE Group, Inc. shareholders $ 0.51 $ 0.48