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Component of Property and Equipment and their Estimated Useful Lives (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment $ 170,307 $ 170,462
Less accumulated depreciation 102,888 119,139
Property and equipment, net 67,419 51,323
Land and land improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment 16,884 13,958
Buildings and leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment 30,877 27,571
Fleet and other equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment 54,685 46,260
Tanks and equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment 26,204 21,445
Furniture, fixtures and office equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment $ 41,657 $ 61,228