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International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 839,055us-gaap_Revenues	$ 682,090us-gaap_Revenues		$ 633,031us-gaap_Revenues
Income from operations	62,664us-gaap_OperatingIncomeLoss	50,737us-gaap_OperatingIncomeLoss	[1]	45,349us-gaap_OperatingIncomeLoss	[1]
Identifiable assets	629,602us-gaap_Assets	438,476us-gaap_Assets
Other
Segment Reporting Information [Line Items]
Net sales	260,874us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember	236,839us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember		227,568us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember
Income from operations	15,840us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember	14,822us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember		14,470us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember
Income before income taxes	17,315us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember	16,241us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember		13,731us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember
Identifiable assets	$ 219,036us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember	$ 205,317us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember		$ 179,263us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = alg_EuropeCanadaandAustraliaMember
[1] As adjusted for the immaterial correction. See Note 1.

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