Condensed Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Share capital	Share capital Class A Stock	Contributed capital	Retained earnings		Accumulated other comprehensive income	Parent	Noncontrolling interest
Balance at beginning of period at Dec. 31, 2020		$ 39,333		$ 41,481	$ 601,406		$ 3,448		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock			$ 3,808
Repurchase of Class A non-voting common stock for cancellation			0
Share-based expense				2,460
Vested employee share plan awards				(8,512)
Net income	$ 38,658				38,658	[1]
Dividends paid					(1,506)
Currency translation adjustment	(836)						(836)
Net income attributable to non-controlling interest	0								0
Balance at end of period at Mar. 31, 2021	719,740	43,141		35,429	638,558		2,612	$ 719,740	0
Balance at beginning of period at Dec. 31, 2020	0
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions during the year	0
Balance at end of period at Mar. 31, 2021	$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.12
Balance at beginning of period at Dec. 31, 2021	$ 825,265	36,442		41,603	740,926		4,225		2,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A non-voting common stock			2,344
Repurchase of Class A non-voting common stock for cancellation			$ (16,158)
Share-based expense				2,821
Vested employee share plan awards				(4,595)
Net income	9,292				9,292	[1]
Dividends paid					(1,895)
Currency translation adjustment	(614)						(614)
Net income attributable to non-controlling interest	486								486
Balance at end of period at Mar. 31, 2022	816,946	$ 22,628		$ 39,829	$ 748,323		$ 3,611	$ 814,391	$ 2,555
Balance at beginning of period at Dec. 31, 2021	127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions during the year	0
Balance at end of period at Mar. 31, 2022	$ 127,765
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends paid per share (in dollars per share)	$ 0.15

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