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Long-Term Debt (Schedule of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 190,575us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	$ 428us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Current maturities of long-term debt and capital lease obligations	551us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	420us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt and capital lease obligation, net of current maturities	190,024us-gaap_LongTermDebtAndCapitalLeaseObligations	8us-gaap_LongTermDebtAndCapitalLeaseObligations
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement
Debt Instrument [Line Items]
Total debt	190,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_DebtInstrumentAxis = alg_AmendedAndRestatedRevolvingCreditAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember	0us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_DebtInstrumentAxis = alg_AmendedAndRestatedRevolvingCreditAgreementMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Capital lease obligations
Debt Instrument [Line Items]
Total debt	59us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	120us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Other notes payable
Debt Instrument [Line Items]
Total debt	$ 516us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	$ 308us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ 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 210.5-02.22)

-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 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ 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 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of long-term debt and capital lease obligations including current maturities.

+ References

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