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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 28, 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 001-10883    
Entity Registrant Name WABASH NATIONAL CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 52-1375208    
Entity Address, Address Line One 1000 Sagamore Parkway South    
Entity Address, City or Town Lafayette    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47905    
City Area Code 765    
Local Phone Number 771-5300    
Title of 12(b) Security Common Stock, $.01 Par Value    
Trading Symbol WNC    
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    
Entity Shell Company false    
Entity Public Float     $ 881,067,878
Entity Common Stock, Shares Outstanding (in shares)   53,082,095  
Documents Incorporated by Reference
Part III of this Form 10-K incorporates by reference certain portions of the registrant’s Proxy Statement for its Annual Meeting of Stockholders to be filed within 120 days after December 31, 2019.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000879526    
Current Fiscal Year End Date --12-31