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Income Taxes - Net Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets (liabilities):    
Stock-based compensation $ 1,446 $ 2,658
Investment in Paycom Payroll Holdings, LLC 101 (1,487)
Net operating losses 1,677 36
Federal tax credits 70  
Noncurrent deferred income tax assets, net $ 3,294 $ 1,207