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International Operations and Geographic Information (Schedule of Geographic Net Sales and Location of Long-lived assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 839,055us-gaap_Revenues	$ 682,090us-gaap_Revenues	$ 633,031us-gaap_Revenues
Long-Lived Assets	235,684us-gaap_NoncurrentAssets	100,852us-gaap_NoncurrentAssets	97,633us-gaap_NoncurrentAssets
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	571,817us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	449,119us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	405,761us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Long-Lived Assets	168,404us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	42,053us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	46,749us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	58,976us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB	36,892us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB	40,735us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB
Long-Lived Assets	20,840us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	19,718us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	13,809us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	93,699us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_FR	97,959us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_FR	92,964us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_FR
Long-Lived Assets	21,728us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR	25,751us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR	25,166us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	54,087us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA	45,212us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA	36,366us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA
Long-Lived Assets	23,354us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	12,562us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	11,719us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	13,702us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU	11,519us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU	10,232us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU
Long-Lived Assets	1,358us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU	768us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU	190us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AU
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 46,774us-gaap_Revenues / us-gaap_StatementGeographicalAxis = alg_OtherGeographicalAreasMember	$ 41,389us-gaap_Revenues / us-gaap_StatementGeographicalAxis = alg_OtherGeographicalAreasMember	$ 46,973us-gaap_Revenues / us-gaap_StatementGeographicalAxis = alg_OtherGeographicalAreasMember

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

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