Organization and Description of Business - Additional Information (Detail) - USD ($)									12 Months Ended
	Nov. 19, 2015	Nov. 18, 2015	Sep. 23, 2015	Sep. 15, 2015	May 20, 2015	Jan. 21, 2015	Apr. 21, 2014	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from initial public offering, net of offering costs										$ 62,840,000
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock issued, shares							7,641,750
Offering price per share							$ 15.00
Proceeds from sale of shares received from selling stockholders							$ 0
Gross proceeds received from public offering							69,100,000
Proceeds from initial public offering, net of offering costs							$ 62,800,000
Public Offering [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock issued, shares						6,422,750
Offering price per share						$ 22.50
Proceeds from sale of common stock under public offering						$ 0
Secondary Offering [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock issued, shares		4,500,000		4,500,000	8,000,000
Offering price per share		$ 42.15		$ 37.95	$ 36.25
Proceeds from sale of common stock under public offering	$ 0		$ 0		$ 0
Additional purchase of common shares	585,697		675,000
Executive Officers And Other Selling Shareholders [Member] | IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock sold by selling stockholders							3,034,868
Paycom Software, Inc. [Member] | IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock issued, shares							4,606,882
Restricted Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Conversion of units to shares								8,121,101			8,121,101
Common Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Conversion of units to shares								45,708,573			45,708,573
Common Stock [Member] | IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Common stock issued, shares										4,606,882
Series C Preferred Units [Member] | WCAS Capital Partners IV, L.P., [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Preferred units held, amount								$ 46,200,000			$ 46,200,000
14% Note due 2017 [Member] | WCAS Capital Partners IV, L.P., [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Notes payable, due date									Apr. 03, 2017
Notes payable, amount								$ 46,200,000			$ 46,200,000
Debt instrument, interest rate								14.00%			14.00%
10% Senior Note due 2022 [Member] | WCAS Capital Partners IV, L.P., [Member] | IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Debt instrument, interest rate							10.00%
Repayment for senior notes							$ 3,300,000