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Fair Value of Financial Instruments Additional Information (Detail) (Forward contracts, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 364.9invest_DerivativeNotionalAmount |  | $ 479.9invest_DerivativeNotionalAmount
Accrued expenses |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fair value foreign currency forward contracts, liabilities | 0.1us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |  |
Other accounts receivable |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fair value foreign currency forward contracts, assets |  |  | 0.6us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember
Other income (expenses), net |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Recognized gains (losses) of foreign currency forward contracts | (20.4)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherIncomeExpenseNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | (1.1)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherIncomeExpenseNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Other, net |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Change in the fair value of foreign currency forward contracts | 20.4alb_ChangeInFairValueOfForeignCurrencyForwardContracts / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | 1.1alb_ChangeInFairValueOfForeignCurrencyForwardContracts / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |
Cash settlements | $ (19.7)us-gaap_DerivativeCashReceivedOnHedge / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember | $ (0.8)us-gaap_DerivativeCashReceivedOnHedge / us-gaap_ConcentrationRiskByBenchmarkAxis = alb_OtherNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember |

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- Definition The change in the fair value of foreign currency forward contracts that are not designated as hedging instruments. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The amount of cash received during the period on settlement of a hedge. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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