Equity - Common Stock Outstanding (Details) - shares	12 Months Ended
Equity - Common Stock Outstanding (Details) - shares	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	44,899,246	42,988,563	41,806,215
Repurchase of Class A shares (in shares)	(2,758,725)	0	(564,189)
Exercise of warrants (in shares)	10,417,322
Issuance of Class A common stock (in shares)	3,752,965
Exchange of Partnership units for Class A common stock and cancellation of Class C common stock (in shares)	2,569,415
Common stock outstanding, ending balance (in shares)	60,721,681	44,899,246	42,988,563
Class A Common Stock \| Restricted Stock Units (RSUs)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares delivered for vested RSUs (in shares)	1,841,458	1,910,683	1,746,537
Class B common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	0	0	0
Repurchase of Class A shares (in shares)	0		0
Exercise of warrants (in shares)	0
Issuance of Class A common stock (in shares)	0
Exchange of Partnership units for Class A common stock and cancellation of Class C common stock (in shares)	0
Common stock outstanding, ending balance (in shares)	0	0	0
Class B common stock \| Restricted Stock Units (RSUs)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares delivered for vested RSUs (in shares)	0	0	0
Class C Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock outstanding, beginning balance (in shares)	144,235,246	144,235,246	144,235,246
Repurchase of Class A shares (in shares)	0		0
Exercise of warrants (in shares)	0
Issuance of Class A common stock (in shares)	0
Exchange of Partnership units for Class A common stock and cancellation of Class C common stock (in shares)	2,569,415
Common stock outstanding, ending balance (in shares)	141,665,831	144,235,246	144,235,246
Class C Common Stock \| Restricted Stock Units (RSUs)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares delivered for vested RSUs (in shares)	0	0	0

GCM Grosvenor Inc. 10-K