XML 104 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 25, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Entity File Number 001-36777    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity Registrant Name JAMES RIVER GROUP HOLDINGS, LTD.    
Title of 12(b) Security Common Shares, par value $0.0002 per share    
City Area Code 441    
Entity Incorporation, State or Country Code D0    
Entity Central Index Key 0001620459    
Trading Symbol JRVR    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Well-known Seasoned Issuer Yes    
Entity Common Stock, Shares Outstanding   30,520,337  
Entity Public Float     $ 1,383,652,430
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Tax Identification Number 98-0585280    
Local Phone Number 278-4580    
Security Exchange Name NASDAQ    
Entity Address, Address Line Three Wellesley House    
Entity Address, Address Line Two 2nd Floor    
Entity Address, Address Line One 90 Pitts Bay Road    
Entity Address, City or Town Pembroke    
Entity Address, Postal Zip Code HM08    
Entity Address, Country BM    
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE:
Portions of the James River Group Holdings, Ltd. Proxy Statement to be filed with the Securities and Exchange Commission within 120 days after the year covered by this Form 10-K with respect to the 2020 Annual General Meeting of Shareholders are incorporated by reference into Part III hereof.