XML 25 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Retirement Benefit Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Pension expense | $ 71 | $ 100 | $ 212 | $ 301
Required 2012 pension contributions |  |  | 1,571 |
Current contributions |  |  | 1,308 |
Supplemental Employee Retirement Plans, Defined Benefit |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Pension expense | $ 136 | $ 123 | $ 407 | $ 369
Requisite service period |  |  | 10 years |
Percentage of final 3 year average salary in which retirement benefit is based (percentage) |  |  | 20.00% |
Term of final average salary used to determine retirement benefit |  |  | 3 years |
Retirement age |  |  | 65 years |
Period after death or change in control benefit will be paid |  |  | 90 days |
Maximum contractual term |  |  | 15 years |
Gradall Company Hourly Employees Pension Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Former employees covered by pension plan |  |  | 330 |
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees) |  |  | 135 |
Gradall Company Hourly Employees Retirement Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Former employees covered by pension plan |  |  | 239 |
Current employees covered in the Gradall Company Hourly Employees' Pension Plan who were formerly employeed by former parent (Employees) |  |  | 87 |

X
- Definition Current Employees Covered By Pension Plan + References No definition available. + Details
Name: | alg_CurrentEmployeesCoveredByPensionPlan
Namespace Prefix: | alg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement Maximum Contractual Term + References No definition available. + Details
Name: | alg_DeferredCompensationArrangementMaximumContractualTerm
Namespace Prefix: | alg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement Requisite Service Period + References No definition available. + Details
Name: | alg_DeferredCompensationArrangementRequisiteServicePeriod
Namespace Prefix: | alg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement with Individual, Description Duration Limit Vested Retirement Benefit Will Be Paid After Death Or Change In Control + References No definition available. + Details
Name: | alg_DeferredCompensationArrangementWithIndividualDescriptionDurationLimitVestedRetirementBenefitWillBePaidAfterDeathOrChangeInControl
Namespace Prefix: | alg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement with Individual, Description Of Plan Retirement Age + References No definition available. + Details
Name: | alg_DeferredCompensationArrangementWithIndividualDescriptionOfPlanRetirementAge
Namespace Prefix: | alg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Compensation Arrangement with Individual, Description Term Of Final Average Salary Used To Determine Retirement Benefit + References No definition available. + Details
Name: | alg_DeferredCompensationArrangementWithIndividualDescriptionTermOfFinalAverageSalaryUsedToDetermineRetirementBenefit
Namespace Prefix: | alg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Former Employees Covered By Pension Plan + References No definition available. + Details
Name: | alg_FormerEmployeesCoveredByPensionPlan
Namespace Prefix: | alg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Final Three Years Average Salary Retirement Benefit Assumption + References No definition available. + Details
Name: | alg_PercentageOfFinalThreeYearsAverageSalaryRetirementBenefitAssumption
Namespace Prefix: | alg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration