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Cash and Cash Equivalents and Short-term Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Cash and cash equivalents and short-term investments |  |
Cash and cash equivalents, fair value | $ 501,149 us-gaap_CashAndCashEquivalentsFairValueDisclosure | $ 389,915 us-gaap_CashAndCashEquivalentsFairValueDisclosure
Available-for-sale equities securities |  |
Available-for-sale equity securities, fair value | 35,020 us-gaap_AvailableForSaleSecurities | 117,218 us-gaap_AvailableForSaleSecurities
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value | 18 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent | 20,276 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Available-for-sale securities, gross unrealized holding gains | 14,648 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 72,530 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Available-for-sale securities, gross unrealized holding losses | (1)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | (56)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Total short-term investments | 35,020 us-gaap_ShortTermInvestments | 117,218 us-gaap_ShortTermInvestments
Total cash, cash equivalents and short-term investments, fair value | 536,169 us-gaap_CashCashEquivalentsAndShortTermInvestments | 507,133 us-gaap_CashCashEquivalentsAndShortTermInvestments
Total cash, cash equivalents and short-term investments, gross unrealized gains | 14,648 nbr_CashCashEquivalentsAndShortTermInvestmentsGrossUnrealizedGains | 72,530 nbr_CashCashEquivalentsAndShortTermInvestmentsGrossUnrealizedGains
Total cash, cash equivalents and short-term investments, gross unrealized losses | (1)nbr_CashCashEquivalentsAndShortTermInvestmentsGrossUnrealizedLosses | (56)nbr_CashCashEquivalentsAndShortTermInvestmentsGrossUnrealizedLosses
Equity Securities |  |
Available-for-sale equities securities |  |
Available-for-sale equity securities, fair value | 35,002 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 96,942 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale debt securities: |  |
Available-for-sale securities, gross unrealized holding gains | 14,648 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 68,395 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Debt Securities |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value | 18 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 20,276 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Available-for-sale securities, gross unrealized holding gains |  | 4,135 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Available-for-sale securities, gross unrealized holding losses | (1)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | (56)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Corporate Debt Securities |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value |  | 19,388 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities, gross unrealized holding gains |  | 4,122 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Collateralized Mortgage Backed Securities |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value |  | 210 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Available-for-sale securities, gross unrealized holding gains |  | 11 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Collateralized Debt Obligations |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value | 18 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedDebtObligationsMember | 20 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedDebtObligationsMember
Available-for-sale securities, gross unrealized holding losses | (1)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedDebtObligationsMember | (2)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedDebtObligationsMember
Asset-backed Securities |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities, fair value |  | 658 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities, gross unrealized holding gains |  | 2 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities, gross unrealized holding losses |  | (54)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Short-term Investments. |  |
Available-for-sale debt securities: |  |
Available-for-sale securities, gross unrealized holding gains | 14,648 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember | 72,530 nbr_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember
Available-for-sale securities, gross unrealized holding losses | (1)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember | (56)nbr_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember
Total short-term investments | $ 35,020 us-gaap_ShortTermInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember | $ 117,218 us-gaap_ShortTermInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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