Acquisitions Acquisitions - Other Acquisitions (Details) (USD $)	3 Months Ended								12 Months Ended						12 Months Ended						12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member]	Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions [Member]	Dec. 31, 2010 Series of Individually Immaterial Business Acquisitions [Member]	Jun. 30, 2012 CIFAL [Member]	Jun. 30, 2012 Engetran [Member]	Jun. 30, 2012 Trail Com [Member]	Dec. 31, 2011 Innovative Molding [Member]	Dec. 31, 2011 Lamons India [Member]	Dec. 31, 2011 BTM Manufacturing [Member]	Dec. 31, 2010 Taylor-Wharton Cylinder [Member]	Dec. 31, 2010 South Texas Bolt and Fitting [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid												$ 27,000,000	$ 31,700,000	$ 29,100,000				$ 27,000,000	$ 2,100,000	$ 2,600,000	$ 11,100,000	$ 18,000,000
Business Acquisition, Deferred Purchase Price and Contingent Consideration												14,000,000
Net sales	301,040,000	335,870,000	338,430,000	297,570,000	259,650,000	277,660,000	288,090,000	258,560,000	1,272,910,000	1,083,960,000	902,460,000				9,000,000	6,000,000	12,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount																					$ 400,000