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The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. 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A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) false 5 Intangible assets, net 2 us-gaap_FiniteLivedIntangibleAssetsNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 410499000 410499000 false false false 2 false false false false 0 0 false false false 3 false true false false 410499000 410499000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 349542000 349542000 false false false xbrli:monetaryItemType monetary The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. 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The value is stated at fair value based on the purchase price allocation. 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This element increases net cash provided by operating activities. 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No authoritative reference available. true 15 Ending Balance 2 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 763589000 763589000 false false false 2 false false false false 0 0 false false false 3 false true false false 763589000 763589000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false true false false 578116000 578116000 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. 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No authoritative reference available. false 18 Amortization of intangible assets 2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 46800000 46800000 false false false 2 false true false false 21600000 21600000 false false false 3 false true false false 136000000 136000000 false false false 4 false true false false 68100000 68100000 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Aggregate amount of amortization expense recognized for intangible asset during the period. A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life. 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No authoritative reference available. false 20 Amortization expense related to the intangible assets acquired in the Gloucester acquisition 2 celg_AmortizationExpenseRelatedToIntangibleAssetsAcquired celg false debit duration Amortization expense related to the intangible assets acquired. false false false false false false false false false false false verboselabel false 1 false true false false 6600000 6600000 false false false 2 false false false false 0 0 false false false 3 false true false false 15300000 15300000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amortization expense related to the intangible assets acquired. No authoritative reference available. false 21 Amortization expense associated with certain acquired developed product rights 2 celg_AmortizationExpenseAssociatedWithCertainAcquiredDevelopedProductRights celg false debit duration Amortization expense associated with certain acquired developed product rights. false false false false false false false false false false false verboselabel false 1 false true false false 5100000 5100000 false false false 2 false false false false 0 0 false false false 3 false true false false 19400000 19400000 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amortization expense associated with certain acquired developed product rights. No authoritative reference available. false 22 Estimated amortization of intangible assets for year ending December 31, 2010 2 us-gaap_FutureAmortizationExpenseYearOne us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false true false false 182900000 182900000 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the twelve-month period following the balance sheet date. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) false 24 Estimated amortization of intangible assets for year ending December 31, 2012 2 us-gaap_FutureAmortizationExpenseYearThree us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false true false false 51900000 51900000 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) false 25 Estimated amortization of intangible assets for year ending December 31, 2013 2 us-gaap_FutureAmortizationExpenseYearFour us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 51900000 51900000 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the fourth twelve-month period following the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) false 26 Estimated amortization of intangible assets for year ending December 31, 2014 2 us-gaap_FutureAmortizationExpenseYearFive us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 51700000 51700000 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the fifth twelve-month period following the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) false 27 Acquired IPR&D product rights [Member] 0 na true na na No definition available. false true false false false false false false false false false http://celgene.com/role/intangibleassetsandgoodwilldetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false 9 false false false false 0 0 false false false 10 false false false false 0 0 false false false false 11 USD true false false false Acquired IPR&D product rights [Member] us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis xbrldi http://xbrl.org/2006/xbrldi celg_AcquiredInProcessResearchAndDevelopmentProductRightsMember us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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