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)	Additional paid-in capital	Retained earnings		Accumulated other comprehensive income		Non-controlling interests
Balance at beginning of year at Dec. 31, 2020	[1]			$ 12	$ 80,802	$ 601,406		$ 3,448		$ 11,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock	[1]			1	4,846
Repurchase of Class A non-voting common stock for cancellation	[1]				(7,738)
Share-based expense	[1]				10,514
Vested employee share plan awards	[1]				(9,739)
Change in redemption value of redeemable non-controlling interests	[1]	$ 10,519			(653)					(9,866)
Net income (loss) attributable to non-controlling interests		158,964				158,964	[1],[2]			(11)	[1]
Dividends paid	[1]					(19,444)
Currency translation adjustment		777						777	[1]
Balance at end of year at Dec. 31, 2021	[1]	825,265	$ 823,196	13	78,032	740,926		4,225		2,069
Balance at beginning of year at Dec. 31, 2020	[1]	117,246
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable non-controlling interests	[1]	0
Change in redemption value of redeemable non-controlling interests	[1]	10,519			(653)					(9,866)
Balance at end of year at Dec. 31, 2021	[1]	$ 127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	[1]	$ 1.54
Issuance of Class A non-voting common stock					2,924
Repurchase of Class A non-voting common stock for cancellation				(2)	(58,581)	(2,055)
Share-based expense					11,555
Vested employee share plan awards					(5,081)
Change in redemption value of redeemable non-controlling interests		$ 1,237			(221)					(1,016)
Net income (loss) attributable to non-controlling interests		32,110				32,351	[2]			(241)
Dividends paid						(7,044)
Currency translation adjustment		(2,809)						(2,809)
Capital distribution to non-controlling interests										(90)
Balance at end of year at Dec. 31, 2022		794,955	794,233	11	28,628	764,178		1,416		722
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable non-controlling interests		(103,536)
Change in redemption value of redeemable non-controlling interests		1,237			(221)					(1,016)
Balance at end of year at Dec. 31, 2022		$ 25,466
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)		$ 0.60
Issuance of Class A non-voting common stock					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	[2]			93
Dividends paid						(6,452)
Currency translation adjustment		(502)						(502)
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
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 Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)		$ 0.60

[1] (1) Certain prior period reported amounts were reclassified to conform to the current period presentation, See Note 2.

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