Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income (loss) attributable to Stewart	$ 3,130	$ (8,190)
Denominator (000):
Basic average shares outstanding (in shares)	27,512	27,201
Diluted average shares outstanding (in shares)	28,027	27,201
Basic earnings (loss) per share attributable to Stewart (in usd per share)	$ 0.11	$ (0.30)
Diluted earnings (loss) per share attributable to Stewart (in usd per share)	$ 0.11	$ (0.30)
Stock options
Denominator (000):
Average number of dilutive shares relating to options and restricted units (in shares)	197	0
Restricted stock and restricted stock units
Denominator (000):
Average number of dilutive shares relating to options and restricted units (in shares)	318	0