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Long Term Debt (Narrative) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
May 13, 2014
May 12, 2014
Debt Instrument [Line Items]        
Total debt $ 208,524,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities $ 190,575,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities    
Amended and Restated Revolving Credit Agreement | Bank revolving credit facility        
Debt Instrument [Line Items]        
Aggregate Commitments 250,000,000alg_DebtInstrumentCovenantComplianceAggregateCommitments
/ us-gaap_DebtInstrumentAxis
= alg_AmendedAndRestatedRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Maximum amount of additional aggregate commitments (Up to $50,000,000) 50,000,000alg_DebtInstrumentCovenantComplianceMaximumIncreaseAmountOfAggregateCommitments
/ us-gaap_DebtInstrumentAxis
= alg_AmendedAndRestatedRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Total debt 208,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_DebtInstrumentAxis
= alg_AmendedAndRestatedRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Available borrowings 40,589,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= alg_AmendedAndRestatedRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Amended and Restated Revolving Credit Agreement | Standby Letters of Credit | Bank revolving credit facility        
Debt Instrument [Line Items]        
Amount of capacity 1,411,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_DebtInstrumentAxis
= alg_AmendedAndRestatedRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Amended and Restated Revolving Credit Agreement | Specialized Industries LP | Revolving Credit Facility        
Debt Instrument [Line Items]        
Amount of 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