Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 03, 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 001-33757    
Entity Registrant Name ENSIGN GROUP, INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 33-0861263    
Entity Address, Address Line One 29222 Rancho Viejo Road, Suite 127    
Entity Address, City or Town San Juan Capistrano    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92675    
City Area Code 949    
Local Phone Number 487-9500    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol ENSG    
Security Exchange Name NASDAQ    
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    
Entity Shell Company false    
Entity Public Float     $ 2,103,068,000
Entity Common Stock, Shares Outstanding   53,531,071  
Documents Incorporated by Reference
Part III of this Form 10-K incorporates information by reference from the Registrant's definitive proxy statement for the Registrant's 2019 Annual Meeting of Stockholders to be filed within 120 days after the close of the fiscal year covered by this annual report.
Entity Central Index Key 0001125376    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false