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Retirement Benefit Plans (Weighted Average Asset Allocations) (Details) (Pension Plans, Defined Benefit)	Dec. 31, 2014	Dec. 31, 2013
Hourly Employees’ Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Hourly Employees’ Pension Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	53.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember	55.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Hourly Employees’ Pension Plan | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	38.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember	38.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Hourly Employees’ Pension Plan | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember	2.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Hourly Employees’ Pension Plan | Other
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	4.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember	5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Employees’ Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Employees’ Retirement Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	55.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember	55.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Employees’ Retirement Plan | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	38.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember	38.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Employees’ Retirement Plan | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	3.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember	2.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Employees’ Retirement Plan | Other
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	4.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember	5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherInvestmentsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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