Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 29, 2014 Common Stock	Jul. 29, 2014 Class B Common Stock
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Trading Symbol	STC
Entity Registrant Name	STEWART INFORMATION SERVICES CORP
Entity Central Index Key	0000094344
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,393,794	1,050,012