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Basis of Presentation - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Store
States
Jan. 01, 2018
USD ($)
Basis Of Presentation [Line Items]    
Entity formed, year 1998  
Number of Locations | Store 402  
Number of states | States 40  
Usual completion period for contracts with service elements 30 days  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606    
Basis Of Presentation [Line Items]    
Cumulative effect adjustment to beginning balance accumulated deficit including tax   $ 2.0
Cumulative effect adjustment to beginning balance accumulated deficit net of tax   $ 1.5