CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive (loss) income	Treasury stock	Noncontrolling interests
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	148,991			148,991
Dividends on Common Stock	(32,853)			(32,853)
Stock-based compensation	9,239	155	9,084
Stock repurchases	(3,168)	(49)	(3,119)
Purchase of remaining interest in consolidated subsidiary	(72)						(72)
Stock option and employee stock purchase plan exercises	5,799	124	5,675
Change in net unrealized gains and losses on investments, net of taxes	(41,513)				(41,513)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(687)				(687)
Foreign currency translation adjustments, net of taxes	(22,861)				(22,861)
Net income attributable to noncontrolling interests	14,534						14,534
Distributions to noncontrolling interests	(14,863)						(14,863)
Net effect of other changes in ownership	220						220
Balances at end of period at Sep. 30, 2022	1,357,501	27,476	294,016	1,090,938	(64,808)	(2,666)	12,545
Balances at beginning of period at Jun. 30, 2022	1,359,821	27,390	288,834	1,073,788	(40,202)	(2,666)	12,677
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	29,434			29,434
Dividends on Common Stock	(12,284)			(12,284)
Stock-based compensation	2,799	29	2,770
Stock repurchases	(617)	(12)	(605)
Stock option exercises	3,086	69	3,017
Purchase of remaining interest in consolidated subsidiary	(72)						(72)
Change in net unrealized gains and losses on investments, net of taxes	(8,921)				(8,921)
Reclassification adjustment for realized gains and losses on investments, net of taxes	(385)				(385)
Foreign currency translation adjustments, net of taxes	(15,300)				(15,300)
Net income attributable to noncontrolling interests	5,294						5,294
Distributions to noncontrolling interests	(5,380)						(5,380)
Net effect of other changes in ownership	26						26
Balances at end of period at Sep. 30, 2022	1,357,501	27,476	294,016	1,090,938	(64,808)	(2,666)	12,545
Balances at beginning of period at Dec. 31, 2022	1,370,265	27,483	296,861	1,091,816	(51,343)	(2,666)	8,114
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	21,624			21,624
Dividends on Common Stock	(38,216)			(38,216)
Stock-based compensation	10,310	134	10,176
Stock repurchases	(1,576)	(37)	(1,539)
Stock option and employee stock purchase plan exercises	4,846	129	4,717
Change in net unrealized gains and losses on investments, net of taxes	(6,616)				(6,616)
Reclassification adjustment for realized gains and losses on investments, net of taxes	333				333
Foreign currency translation adjustments, net of taxes	(995)				(995)
Net income attributable to noncontrolling interests	10,870						10,870
Distributions to noncontrolling interests	(11,646)						(11,646)
Balances at end of period at Sep. 30, 2023	1,359,199	27,709	310,215	1,075,224	(58,621)	(2,666)	7,338
Balances at beginning of period at Jun. 30, 2023	1,365,995	27,620	304,405	1,074,458	(45,326)	(2,666)	7,504
Increase (Decrease) in Stockholders' Equity
Net income attributable to Stewart	13,999			13,999
Dividends on Common Stock	(13,233)			(13,233)
Stock-based compensation	3,267	17	3,250
Stock repurchases	(223)	(5)	(218)
Stock option and employee stock purchase plan exercises	2,855	77	2,778
Change in net unrealized gains and losses on investments, net of taxes	(7,468)				(7,468)
Reclassification adjustment for realized gains and losses on investments, net of taxes	20				20
Foreign currency translation adjustments, net of taxes	(5,847)				(5,847)
Net income attributable to noncontrolling interests	3,931						3,931
Distributions to noncontrolling interests	(4,097)						(4,097)
Balances at end of period at Sep. 30, 2023	$ 1,359,199	$ 27,709	$ 310,215	$ 1,075,224	$ (58,621)	$ (2,666)	$ 7,338