v3.26.1
Earnings (Loss) Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator for earnings (loss) per share calculation:        
Net income attributable to GCM Grosvenor Inc., basic $ 9,564 $ 15,437 $ 15,031 $ 15,900
Net income attributable to common stockholders, diluted $ 23,413 $ 9,554 $ 35,646 $ 14,238
Denominator for earnings (loss) per share calculation:        
Weighted-average shares, basic (in shares) 61,065,330 51,074,156 61,045,007 48,367,585
Exchange of partnership units (in shares) 141,665,831 142,823,480 141,665,831 143,525,463
Assumed vesting of RSUs - incremental shares under the treasury stock method (in shares) 852,435 1,214,043 1,463,117 1,904,029
Weighted-average shares, diluted (in shares) 203,583,596 196,338,595 204,173,955 195,641,160
Basic EPS        
Net income attributable to common stockholders, basic $ 9,564 $ 15,437 $ 15,031 $ 15,900
Weighted-average shares, basic (in shares) 61,065,330 51,074,156 61,045,007 48,367,585
Net income per share attributable to common stockholders, basic (in dollars per share) $ 0.16 $ 0.30 $ 0.25 $ 0.33
Diluted EPS        
Net income attributable to common stockholders, diluted $ 23,413 $ 9,554 $ 35,646 $ 14,238
Weighted-average shares, diluted (in shares) 203,583,596 196,338,595 204,173,955 195,641,160
Net income (loss) per share attributable common stockholders, diluted (in dollars per share) $ 0.12 $ 0.05 $ 0.17 $ 0.07
Partnership Units        
Numerator for earnings (loss) per share calculation:        
Exchange of Partnership units $ 13,849 $ (994) $ 20,615 $ 977
Private warrants        
Numerator for earnings (loss) per share calculation:        
Exchange of Partnership units $ 0 $ (297) $ 0 $ (166)
Denominator for earnings (loss) per share calculation:        
Exercise of warrants- incremental shares under treasury stock method (in shares) 0 63,298 0 94,589
Public warrants        
Numerator for earnings (loss) per share calculation:        
Exchange of Partnership units $ 0 $ (4,592) $ 0 $ (2,473)
Denominator for earnings (loss) per share calculation:        
Exercise of warrants- incremental shares under treasury stock method (in shares) 0 1,163,618 0 1,749,494