CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (unaudited) - 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	Noncontrolling interest
Balance at beginning of period at Dec. 31, 2021			$ 12		$ 78,034		$ 740,926			$ 4,225	$ 2,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				$ 0		$ 2,344
Repurchase of Class A non-voting common stock for cancellation				(1)		(46,375)			$ 0
Share-based expense					6,053
Vested employee share plan awards					(4,595)
Change in redemption value of redeemable noncontrolling interests	$ 0				0						0
Net income (loss)	5,418						5,418	[1]
Dividends paid							(3,730)
Currency translation adjustment	(2,652)									(2,652)
Capital distribution to noncontrolling interest											0
Net loss attributable to noncontrolling interest	(360)										(360)
Balance at end of period at Jun. 30, 2022	781,368	$ 779,659	11		35,461		742,614			1,573	1,709
Balance at beginning of period at Dec. 31, 2021	127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable noncontrolling interests	0
Change in redemption value of redeemable noncontrolling interests	0				0						0
Balance at end of period at Jun. 30, 2022	$ 127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.30
Balance at beginning of period at Mar. 31, 2022			12		62,446		748,323			3,611	2,555
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				0		0
Repurchase of Class A non-voting common stock for cancellation				(1)		(30,217)			0
Share-based expense					3,232
Vested employee share plan awards					0
Change in redemption value of redeemable noncontrolling interests	$ 0				0						0
Net income (loss)	(3,874)						(3,874)	[1]
Dividends paid							(1,835)
Currency translation adjustment	(2,038)									(2,038)
Capital distribution to noncontrolling interest											0
Net loss attributable to noncontrolling interest	(846)										(846)
Balance at end of period at Jun. 30, 2022	781,368	779,659	11		35,461		742,614			1,573	1,709
Balance at beginning of period at Mar. 31, 2022	127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable noncontrolling interests	0
Change in redemption value of redeemable noncontrolling interests	0				0						0
Balance at end of period at Jun. 30, 2022	$ 127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.15
Balance at beginning of period at Dec. 31, 2022	$ 794,955		11		28,628		764,178			1,416	722
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				0		5,672
Repurchase of Class A non-voting common stock for cancellation				0		(3,687)			(3,599)
Share-based expense					6,642
Vested employee share plan awards					(11,578)
Change in redemption value of redeemable noncontrolling interests	565				(101)						(464)
Net income (loss)	5,217						5,217	[1]
Dividends paid							(3,325)
Currency translation adjustment	(1,160)									(1,160)
Capital distribution to noncontrolling interest											171
Net loss attributable to noncontrolling interest	(321)										(321)
Balance at end of period at Jun. 30, 2023	788,422	788,314	11		25,576		762,471			256	108
Balance at beginning of period at Dec. 31, 2022	25,466
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable noncontrolling interests	(83)
Change in redemption value of redeemable noncontrolling interests	565				(101)						(464)
Balance at end of period at Jun. 30, 2023	$ 25,948
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.30
Balance at beginning of period at Mar. 31, 2023			11		22,374		777,121			919	433
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock				0		184
Repurchase of Class A non-voting common stock for cancellation				$ 0		$ 0			$ (3,599)
Share-based expense					3,349
Vested employee share plan awards					(259)
Change in redemption value of redeemable noncontrolling interests	$ 400				(72)						(328)
Net income (loss)	(9,400)						(9,400)	[1]
Dividends paid							(1,651)
Currency translation adjustment	(663)									(663)
Capital distribution to noncontrolling interest											171
Net loss attributable to noncontrolling interest	(168)										(168)
Balance at end of period at Jun. 30, 2023	788,422	$ 788,314	$ 11		25,576		$ 762,471			$ 256	108
Balance at beginning of period at Mar. 31, 2023	25,557
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of redeemable noncontrolling interests	(9)
Change in redemption value of redeemable noncontrolling interests	400				$ (72)						$ (328)
Balance at end of period at Jun. 30, 2023	$ 25,948
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.15

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