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Component of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment $ 201,312 $ 184,079
Less accumulated depreciation and amortization 121,639 113,669
Property and equipment, net 79,673 70,410
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 18,127 17,645
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 34,175 32,203
Fleet and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 62,500 57,601
Tanks and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 41,744 34,035
Furniture, fixtures and office equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 44,766 $ 42,595