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Note 6 - Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Raw materials:    
Raw materials $ 145,876us-gaap_InventoryRawMaterialsNetOfReserves $ 153,607us-gaap_InventoryRawMaterialsNetOfReserves
Inventories 183,821us-gaap_InventoryNet 196,556us-gaap_InventoryNet
Blended Drilling Fluids Components [Member]    
Raw materials:    
Blended drilling fluids components 36,851us-gaap_InventoryPartsAndComponentsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_BlendeddrillingFluidsComponentsMember		 40,971us-gaap_InventoryPartsAndComponentsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_BlendeddrillingFluidsComponentsMember
Drilling Fluids [Member]    
Raw materials:    
Raw materials 144,541us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_DrillingFluidsMember		 152,076us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_DrillingFluidsMember
Mats [Member]    
Raw materials:    
Raw materials 1,335us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_MatsMember		 1,531us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_MatsMember
Finished goods- mats $ 1,094us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_MatsMember		 $ 1,978us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_PublicUtilityAxis
= nr_MatsMember