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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Feb. 08, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol PAYC    
Entity Registrant Name Paycom Software, Inc.    
Entity Central Index Key 0001590955    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
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 Common Stock, Shares Outstanding   60,213,519  
Entity Public Float     $ 18.6
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NYSE    
Entity File Number 001-36393    
Entity Tax Identification Number 80-0957485    
Entity Address, Address Line One 7501 W. Memorial Road    
Entity Address, City or Town Oklahoma City    
Entity Address, State or Province OK    
Entity Incorporation, State or Country Code DE    
Entity Address, Postal Zip Code 73142    
City Area Code 405    
Local Phone Number 722-6900    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location Oklahoma City, Oklahoma    
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement on Schedule 14A to be furnished to stockholders in connection with its 2022 Annual Meeting of Stockholders are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K.