XML 53 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 20, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-02658    
Entity Registrant Name STEWART INFORMATION SERVICES CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-1677330    
Entity Address, Address Line One 1360 Post Oak Blvd.,    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Houston,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77056    
City Area Code 713    
Local Phone Number 625-8100    
Title of 12(b) Security Common Stock, $1 par value per share    
Trading Symbol STC    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 994.1
Entity Common Stock, Shares Outstanding   23,679,888  
Documents Incorporated by Reference
Portions of the definitive proxy statement (the Proxy Statement), in connection with the Registrant's 2020 Annual Meeting of Stockholders, are incorporated herein by reference in Part III of this document.
    
Entity Central Index Key 0000094344    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false