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Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 28, 2017
Mar. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Apr. 30, 2018
Oct. 01, 2013
Capital Unit [Line Items]              
Common Stock, authorized shares   150,000,000 150,000,000 150,000,000 500,000,000   100,000,000
Common Stock, par value   $ 0.01 $ 0.01 $ 0.01 $ 0.01   $ 0.01
Common Stock, shares issued     65,285,962 65,001,037 138,049,718 24,150,000  
Common Stock, shares outstanding     65,285,962 65,001,037 138,049,718    
Voting right of common stock     One vote        
Stock issued in equity financing     $ 3.2 $ 75.0      
Receivable from stockholders       $ 75.2      
Junior Preferred Stock [Member]              
Capital Unit [Line Items]              
Preferred Stock, shares authorized     70,000,000 70,000,000     70,000,000
Preferred Stock, par value     $ 0.01 $ 0.01     $ 0.01
Preferred Stock, shares issued     58,244,308 58,244,308      
Preferred Stock, shares outstanding     58,244,308 58,244,308      
Junior Preferred Stock [Member] | Maximum [Member]              
Capital Unit [Line Items]              
Preferred stock liquidation preference     $ 6.75        
Senior Preferred Stock [Member]              
Capital Unit [Line Items]              
Preferred Stock, shares authorized   70,000,000 70,000,000 70,000,000      
Preferred Stock, par value   $ 0.01 $ 0.01 $ 0.01      
Preferred Stock, shares issued     16,802,144 16,802,144      
Preferred Stock, shares outstanding     16,802,144 16,802,144      
Stock issued in equity financing   $ 150.2   $ 150.2      
Receivable from stockholders   75.2          
Preferred stock, dividend rate, percentage     12.50%        
Preferred stock, liquidation preference     In the event of liquidation, the Senior Preferred Stock has a liquidation preference equal to 1.5 times the initial face amount plus any accrued but unpaid dividends.        
Senior Preferred Stock [Member] | Ceridian Holding II [Member]              
Capital Unit [Line Items]              
Equity contributed by stockholders $ 75.2 $ 75.0