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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 26, 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 001-38441    
Entity Registrant Name Apergy Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-3066826    
Entity Address, Address Line One 2445 Technology Forest Blvd    
Entity Address, Address Line Two Building 4, 12th Floor    
Entity Address, City or Town The Woodlands,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77381    
City Area Code 281    
Local Phone Number 403-5772    
Title of 12(b) Security Common stock, $0.01 par value    
Trading Symbol APY    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 2,575,029,140
Entity Common Stock, Shares Outstanding   77,492,835  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement relating to its 2020 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated, or such information will be included in an amendment to this Form 10-K in accordance with Instruction G(3) of Form 10-K.
    
Entity Central Index Key 0001723089    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false