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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 20, 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 001-35113    
Entity Registrant Name GNC Holdings, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-8536244    
Entity Address, Address Line One 300 Sixth Avenue    
Entity Address, Postal Zip Code 15222    
Entity Address, City or Town Pittsburgh,    
Entity Address, State or Province PA    
City Area Code 412    
Local Phone Number 288-4600    
Title of 12(b) Security Class A common stock, par value $0.001 per share    
Trading Symbol GNC    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 123.0
Entity Common Stock, Shares Outstanding   84,608,976  
Documents Incorporated by Reference
Certain information in the Company's definitive Proxy Statement for the 2020 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the fiscal year, is incorporated by reference in Part III of this Form 10-K.
    
Entity Central Index Key 0001502034    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY