CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Balances at beginning of period at Dec. 31, 2020	$ 1,012,406	$ 27,080	$ 274,857	$ 688,819	$ 17,022	$ (2,666)	$ 7,294
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	149,055			149,055
Dividends on common stock	(18,040)			(18,040)
Stock-based compensation	5,879	131	5,748
Stock repurchases	(2,002)	(39)	(1,963)
Stock option and employee stock purchase plan exercises	181	5	176
Purchase of remaining interest in consolidated subsidiary	(5,616)		(4,744)				(872)
Change in net unrealized gains and losses on investments, net of taxes	(8,147)				(8,147)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(563)				(563)
Foreign currency translation adjustments, net of taxes	3,246				3,246
Net income attributable to noncontrolling interests	6,907						6,907
Distributions to noncontrolling interests	(7,253)						(7,253)
Balances at end of period at Jun. 30, 2021	1,136,073	27,177	274,074	819,834	11,558	(2,666)	6,096
Balances at beginning of period at Mar. 31, 2021	1,047,898	27,158	273,820	733,973	9,588	(2,666)	6,025
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	94,819			94,819
Dividends on common stock	(8,958)			(8,958)
Stock-based compensation	2,705	18	2,687
Stock repurchases	(67)	(2)	(65)
Stock option exercises	120	3	117
Purchase of remaining interest in consolidated subsidiary	(3,046)		(2,485)				(561)
Change in net unrealized gains and losses on investments, net of taxes	1,009				1,009
Reclassification adjustment for realized gains and losses on investments, net of taxes	(418)				(418)
Foreign currency translation adjustments, net of taxes	1,379				1,379
Net income attributable to noncontrolling interests	4,021						4,021
Distributions to noncontrolling interests	(3,409)						(3,409)
Net effect of other changes in ownership	20						20
Balances at end of period at Jun. 30, 2021	1,136,073	27,177	274,074	819,834	11,558	(2,666)	6,096
Balances at beginning of period at Dec. 31, 2021	1,294,735	27,246	282,376	974,800	253	(2,666)	12,726
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	119,557			119,557
Dividends on common stock	(20,569)			(20,569)
Stock-based compensation	6,440	126	6,314
Stock repurchases	(2,551)	(37)	(2,514)
Stock option and employee stock purchase plan exercises	2,713	55	2,658
Change in net unrealized gains and losses on investments, net of taxes	(32,592)				(32,592)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(302)				(302)
Foreign currency translation adjustments, net of taxes	(7,561)				(7,561)
Net income attributable to noncontrolling interests	9,240						9,240
Distributions to noncontrolling interests	(9,483)						(9,483)
Net effect of other changes in ownership	194						194
Balances at end of period at Jun. 30, 2022	1,359,821	27,390	288,834	1,073,788	(40,202)	(2,666)	12,677
Balances at beginning of period at Mar. 31, 2022	1,324,788	27,367	284,524	1,022,456	(19,210)	(2,666)	12,317
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	61,660			61,660
Dividends on common stock	(10,328)			(10,328)
Stock-based compensation	4,201	18	4,183
Stock repurchases	(89)	(1)	(88)
Stock option and employee stock purchase plan exercises	221	6	215
Purchase of remaining interest in consolidated subsidiary	0
Change in net unrealized gains and losses on investments, net of taxes	(12,694)				(12,694)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(117)				(117)
Foreign currency translation adjustments, net of taxes	(8,181)				(8,181)
Net income attributable to noncontrolling interests	5,225						5,225
Distributions to noncontrolling interests	(4,915)						(4,915)
Net effect of other changes in ownership	50						50
Balances at end of period at Jun. 30, 2022	$ 1,359,821	$ 27,390	$ 288,834	$ 1,073,788	$ (40,202)	$ (2,666)	$ 12,677