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Store Closing Costs - Schedule of Activity for Company Store Closing Reserves (Detail) - USD ($)
$ in Thousands
 12 Months Ended 18 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]    
Store closing costs   $ (1,100)
Lease Termination Costs [Member]    
Restructuring Cost And Reserve [Line Items]    
Balance at January 1, 2017 $ 788  
Store closing costs (137)  
Payments (631)  
Balance at December 31, 2017 $ 20 $ 20