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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 14, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36157    
Entity Registrant Name ESSENT GROUP LTD.    
Entity Incorporation, State or Country Code D0    
Entity Address, Address Line One Clarendon House    
Entity Address, Address Line Two 2 Church Street    
Entity Address, City or Town Hamilton    
Entity Address, Postal Zip Code HM11    
Entity Address, Country BM    
City Area Code 441    
Local Phone Number 297-9901    
Title of 12(b) Security Common Shares, $0.015 par value    
Trading Symbol ESNT    
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 Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 4,077,458,128
Entity Common Stock, Shares Outstanding   108,095,924  
Documents Incorporated by Reference Portions of the registrant's proxy statement for the 2023 Annual General Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2022.    
Entity Central Index Key 0001448893    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY