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Acquisition of Competitor's Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Nov. 07, 2013
Dec. 31, 2014
Dec. 31, 2013
Acquisition of Competitors Assets [Abstract]      
Customer Contract Intangible Acquired from Competitor $ 21,690npk_CustomerContractIntangibleAcquiredFromCompetitor    
Government Contract Backlog Acquired from Competitor 188,000npk_GovernmentContractBacklogAcquiredFromCompetitor    
Inventory Acquired from Competitor 11,590npk_InventoryAcquiredFromCompetitor    
Equipment Acquired from Competitor 14,245npk_EquipmentAcquiredFromCompetitor    
Acquisition of Competitors Assets Consideration Transferred Total 47,803npk_AcquisitionOfCompetitorsAssetsConsiderationTransferredTotal    
Acquisition of Competitors Assets Payments to Acquire Gross 46,465npk_AcquisitionOfCompetitorsAssetsPaymentsToAcquireGross    
Acquisition of Competitors Assets Consideration Transferred Liabilities Incurred 1,338npk_AcquisitionOfCompetitorsAssetsConsiderationTransferredLiabilitiesIncurred    
Inventory   89,058us-gaap_InventoryNet 92,514us-gaap_InventoryNet
Machinery and Equipment, Gross   $ 126,580us-gaap_MachineryAndEquipmentGross $ 114,056us-gaap_MachineryAndEquipmentGross