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Acquisitions and Investments (Narrative) (Details) (USD $)	0 Months Ended	8 Months Ended	3 Months Ended
	May 13, 2014	Dec. 31, 2014	Jun. 30, 2014 Aquisition	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 12, 2014
Business Acquisition [Line Items]
Goodwill		$ 72,407,000us-gaap_Goodwill		$ 32,073,000us-gaap_Goodwill	$ 31,648,000us-gaap_Goodwill	$ 31,751,000us-gaap_Goodwill
North American Industrial
Business Acquisition [Line Items]
Goodwill		54,036,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember		13,176,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember
Specialized Industries LP
Business Acquisition [Line Items]
Total consideration transferred	193,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Period for post closing adjustments	90 days
New borrowings under the amended credit facility	190,000,000us-gaap_ProceedsFromLinesOfCredit / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Accounts payable	4,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Goodwill	41,327,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Goodwill that is tax deductible	6,500,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Acquisition costs incurred		1,800,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Net sales generated by Specialized business units		107,400,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Net income generated by Specialized business units		5,100,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember
Specialized Industries LP | North American Industrial
Business Acquisition [Line Items]
Goodwill	41,300,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Total consideration transferred			5,594,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Number of acquisitions			2us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Revolving Credit Facility | Amended and Restated Revolving Credit Agreement | Specialized Industries LP
Business Acquisition [Line Items]
Line of credit	$ 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = alg_AmendedAndRestatedRevolvingCreditAgreementMember						$ 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_BusinessAcquisitionAxis = alg_SpecializedIndustriesLPMember / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = alg_AmendedAndRestatedRevolvingCreditAgreementMember

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