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v2.4.1.9

Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Inventory |  |
Raw materials | $ 133,797,000 us-gaap_InventoryRawMaterialsNetOfReserves | $ 128,606,000 us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-progress | 39,617,000 us-gaap_InventoryWorkInProcessNetOfReserves | 26,762,000 us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods | 56,653,000 us-gaap_InventoryFinishedGoodsNetOfReserves | 54,425,000 us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net, Total | 230,067,000 us-gaap_InventoryNet | 209,793,000 us-gaap_InventoryNet
Goodwill |  |
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent) | 3.00%nbr_PercentageOfGrowthRateUsedToCalculateTerminalValueOfEachReportingUnit |
Investments |  |
Fair value of equity security investments | $ 2,800,000 us-gaap_EquityMethodInvestmentsFairValueDisclosure | $ 3,200,000 us-gaap_EquityMethodInvestmentsFairValueDisclosure

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