Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2025	Jul. 29, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Trading Symbol	PAYC
Entity Registrant Name	Paycom Software, Inc.
Entity Central Index Key	0001590955
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		57,876,797
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false