v3.22.0.1
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 16, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-20278    
Entity Registrant Name ENCORE WIRE CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 75-2274963    
Entity Address, Address Line One 1329 Millwood Road    
Entity Address, City or Town McKinney,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75069    
City Area Code 972    
Local Phone Number 562-9473    
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol WIRE    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
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     $ 1,130,147,966
Entity Common Stock, Shares Outstanding   20,228,588  
Documents Incorporated by Reference
Listed below are documents, parts of which are incorporated herein by reference, and the part of this report into which the document is incorporated:
(1)Proxy statement for the 2022 annual meeting of stockholders – Part III
    
Entity Central Index Key 0000850460    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false