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Component of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment $ 210,581 $ 201,312
Less accumulated depreciation and amortization 122,963 121,639
Property and equipment, net 87,618 79,673
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 19,230 18,127
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 34,557 34,175
Fleet and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 66,734 62,500
Tanks and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 45,860 41,744
Furniture, fixtures and office equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 44,200 $ 44,766