v3.6.0.2
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Feb. 23, 2017
Jun. 30, 2016
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    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Voluntary Filers Yes    
Entity Public Float     $ 1,590
Voting ordinary shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   16,419,889  
Non-voting ordinary shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   3,004,443