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Inventory - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials and supplies in inventory, percentage 40.00%nue_RawMaterialAndSuppliesInInventoryPercentage 40.00%nue_RawMaterialAndSuppliesInInventoryPercentage
Finished and semi-finished products in inventory, percentage 60.00%nue_FinishedAndSemiFinishedProductsInInventoryPercentage 60.00%nue_FinishedAndSemiFinishedProductsInInventoryPercentage
Increased value of inventory if FIFO method had been used $ 567.4us-gaap_InventoryLIFOReserve $ 624.7us-gaap_InventoryLIFOReserve
Lower of cost or market adjustments $ 2.7us-gaap_InventoryAdjustments $ 2.1us-gaap_InventoryAdjustments