v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
May 07, 2019
Document Information [Line Items]    
Entity Registrant Name Enstar Group LTD  
Entity Central Index Key 0001363829  
Trading Symbol ESGR  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Voting Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   17,971,679
Non-Voting Convertible Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,509,682