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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Reportable_Segment	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of principal reporting segments	3us-gaap_NumberOfReportableSegments
Net Revenue	$ 839,055us-gaap_SalesRevenueNet	$ 682,090us-gaap_SalesRevenueNet	[1]	$ 633,031us-gaap_SalesRevenueNet	[1]
Income from Operations	62,664us-gaap_OperatingIncomeLoss	50,737us-gaap_OperatingIncomeLoss	[1]	45,349us-gaap_OperatingIncomeLoss	[1]
Goodwill	72,407us-gaap_Goodwill	32,073us-gaap_Goodwill		31,648us-gaap_Goodwill		31,751us-gaap_Goodwill
Total Identifiable Assets	629,602us-gaap_Assets	438,476us-gaap_Assets
North American Industrial
Segment Reporting Information [Line Items]
Net Revenue	436,018us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	297,857us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	[1]	264,504us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	[1]
Income from Operations	39,377us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	25,743us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	[1]	19,313us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	[1]
Goodwill	54,036us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	13,176us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember
Total Identifiable Assets	363,812us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember	161,080us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_IndustrialMember
North American Agricultural
Segment Reporting Information [Line Items]
Net Revenue	214,326us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	219,354us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	[1]	203,945us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	[1]
Income from Operations	11,714us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	17,880us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	[1]	18,319us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	[1]
Goodwill	695us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember
Total Identifiable Assets	113,286us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember	123,352us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_AgriculturalMember
European
Segment Reporting Information [Line Items]
Net Revenue	188,711us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	164,879us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	[1]	164,582us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	[1]
Income from Operations	11,573us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	7,114us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	[1]	7,717us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	[1]
Goodwill	17,676us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	18,897us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember
Total Identifiable Assets	$ 152,504us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember	$ 154,044us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeanMember
[1] As adjusted for the immaterial correction. See Note 1.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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