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Retirement Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimate of amount of unrecognized actuarial expense	$ 649,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Other	0us-gaap_DeferredTaxAssetsOther	34,000us-gaap_DeferredTaxAssetsOther
Accumulated other comprehensive income	(16,359,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	3,038,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Number of defined contribution plans	3alg_DefinedContributionPlanNumberOfPlans
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contribution amount	1,466,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = country_US	1,331,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = country_US	1,678,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = country_US
Non-US
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of defined contribution plans	3alg_DefinedContributionPlanNumberOfPlans / us-gaap_StatementGeographicalAxis = alg_NonUSMember
Annual contribution amount	806,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = alg_NonUSMember	697,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = alg_NonUSMember	696,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_StatementGeographicalAxis = alg_NonUSMember
IAM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual contribution amount	378,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedContributionPlanNameAxis = alg_InternationalAssociationOfMachinistAndAerospaceRetirementPlanMember	422,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DefinedContributionPlanNameAxis = alg_InternationalAssociationOfMachinistAndAerospaceRetirementPlanMember
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimate of amount of unrecognized actuarial expense	342,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
SERP credited service period	10 years
Percentage of final 3 year average salary in which retirement benefit is based (percentage)	20.00%alg_PercentageOfFinalThreeYearsAverageSalaryRetirementBenefitAssumption / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Number of final years in which the Retirement Benefit is based	3 years
Retirement age	65 years
Period of time that vested retirement benefit will be paid after death or change in control	90 days
Years of monthly installments associated with SERP disability	15 years
SERP unfunded long-term liability	1,964,301us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Other	746,000us-gaap_DeferredTaxAssetsOther / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Accumulated other comprehensive income	1,218,301us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Prior service cost that will be amortized over the remaining service periods	$ 1,964,301us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Hourly Employees’ Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees	331alg_FormerEmployeesCoveredByPensionPlan / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Current employees	125alg_CurrentEmployeesCoveredByPensionPlan / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyHourlyEmployeesPensionPlanMember
Employees’ Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Former employees	238alg_FormerEmployeesCoveredByPensionPlan / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Current employees	83alg_CurrentEmployeesCoveredByPensionPlan / us-gaap_MultiemployerPlanNameAxis = alg_GradallCompanyEmployeesRetirementPlanMember
Minimum | Non-US
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution percentage	3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = alg_NonUSMember
Maximum | Non-US
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution percentage	10.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = alg_NonUSMember

X

- Definition

Current Employees Covered By Pension Plan

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- Definition

Deferred Compensation Arrangement with Individual, Description Duration Limit Vested Retirement Benefit Will Be Paid After Death Or Change In Control

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Deferred Compensation Arrangement with Individual, Description Term Of Final Average Salary Used To Determine Retirement Benefit

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Defined Contribution Plan, Number Of Plans

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Former Employees Covered By Pension Plan

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Percentage Of Final Three Years Average Salary Retirement Benefit Assumption

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- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5



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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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