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Components of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Inventory [Line Items]    
Product $ 48,338us-gaap_EnergyRelatedInventoryPetroleum $ 39,802us-gaap_EnergyRelatedInventoryPetroleum
Parts and equipment 19,535us-gaap_OtherInventoriesSpareParts 19,438us-gaap_OtherInventoriesSpareParts
Total inventory $ 67,873us-gaap_InventoryNet $ 59,240us-gaap_InventoryNet