CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND REDEEMABLE NON-CONTROLLING INTERESTS - USD ($) $ in Thousands	Total	Parent	Common stock ($0.001 par value per share)	Common stock ($0.001 par value per share) Class A Stock	Additional paid-in capital	Additional paid-in capital Class A Stock	Retained earnings		Retained earnings Class A Stock	Accumulated other comprehensive income	Non-controlling interests
Balance at beginning of year at Dec. 31, 2022			$ 11		$ 28,628		$ 764,178			$ 1,416	$ 722
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				$ 0		$ 6,061
Repurchase of Class A non-voting common stock for cancellation				(1)		(3,936)			$ (31,437)
Share-based expense					13,058
Vested employee share plan awards					(11,892)
Change in redemption value of redeemable non-controlling interests	$ 689				(145)						(544)
Net income (loss) attributable to non-controlling interests	30,272						30,179	[1]			93
Dividends declared							(6,452)
Currency translation adjustment	(502)									(502)
Contributions during the year											0
Capital distribution to non-controlling interests											(198)
Balance at end of year at Dec. 31, 2023	789,239	$ 789,166	10		31,774		756,468			914	73
Balance at beginning of year at Dec. 31, 2022	25,466
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable non-controlling interests	(26,155)
Change in redemption value of redeemable non-controlling interests	689				(145)						(544)
Balance at end of year at Dec. 31, 2023	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				0		8,800
Repurchase of Class A non-voting common stock for cancellation				0		(8,384)			(1,219)
Share-based expense					12,859
Vested employee share plan awards					(15,580)
Change in redemption value of redeemable non-controlling interests	0				264						237
Net income (loss) attributable to non-controlling interests	71,247						71,557	[1]			(310)
Dividends declared							(6,845)
Currency translation adjustment	(223)									(223)
Contributions during the year											0
Capital distribution to non-controlling interests											0
Balance at end of year at Dec. 31, 2024	850,395	850,395	10		29,733		819,961			691	0
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable non-controlling interests	0
Change in redemption value of redeemable non-controlling interests	0				264						237
Balance at end of year at Dec. 31, 2024	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				0		6,524
Repurchase of Class A non-voting common stock for cancellation				$ 0		$ (90)			$ (2,889)
Share-based expense					12,966
Vested employee share plan awards					(16,430)
Change in redemption value of redeemable non-controlling interests	0				0						0
Net income (loss) attributable to non-controlling interests	147,959						148,403	[1]			(444)
Dividends declared							(18,062)
Currency translation adjustment	3,006									3,006
Contributions during the year											13,650
Capital distribution to non-controlling interests											0
Balance at end of year at Dec. 31, 2025	997,029	$ 983,823	$ 10		32,703		$ 947,413			$ 3,697	13,206
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable non-controlling interests	0
Change in redemption value of redeemable non-controlling interests	0				$ 0						$ 0
Balance at end of year at Dec. 31, 2025	$ 0

[1] (1) Attributable to Oppenheimer Holdings Inc.