Acquisitions Acquisitions - Other Acquisitions (Details) (USD $)	3 Months Ended								12 Months Ended																		2 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Series of Individually Immaterial Business Acquisitions [Member]		Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member]	Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions [Member]	Dec. 31, 2012 Business Acquisition, Martinic [Member]	Dec. 31, 2012 Business Acquisition, Wulfrun [Member]	Sep. 30, 2013 Business Acquisition, Witter [Domain]	Dec. 31, 2013 Business Acquisition, AL-KO [Domain]	Jun. 30, 2013 Business Acquisition, AL-KO [Domain]	Sep. 30, 2013 Business Acquisition, Mac Fasteners [Domain]	Sep. 30, 2013 Business Acquisition - DHF [Domain]	Jun. 30, 2012 CIFAL [Member]	Jun. 30, 2012 Engetran [Member]	Jun. 30, 2012 Trail Com [Member]	May 31, 2011 Innovative Molding [Member]	Feb. 23, 2012 Business Acquisition, Arminak & Associates [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired												100.00%															70.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid														$ 26,800,000	$ 31,700,000
Business Acquisition, Deferred Purchase Price and Contingent Consideration												12,370,000	[1]	14,400,000													8,490,000	[2]
Net sales	323,430,000	355,620,000	378,030,000	337,780,000	301,040,000	335,870,000	338,430,000	297,570,000	1,394,860,000	1,272,910,000	1,083,960,000					13,000,000	10,000,000	20,000,000		16,000,000	17,000,000	12,000,000	9,000,000	6,000,000	12,000,000	28,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount									$ 2,880,000	$ 0	$ 0								$ 2,900,000

[1] Deferred/contingent consideration includes approximately $9.8 million of both short-term and long-term deferred purchase price, based on set amounts and fixed payment schedules per the purchase agreement, and an additional $2.6 million of contingent consideration to be paid based on a multiple of future earnings, as defined.

[2] The contingent consideration represented the Company's best estimate, based on its review, at the time of purchase, of the underlying potential obligations estimated at a range of $8 million to $9 million, of certain Seller tax-related liabilities for which the Company has indemnified the Sellers as part of the purchase agreement. During 2012, the Company paid $4.9 million of additional purchase price related to the contingent consideration. No additional amounts were paid during 2013. The remaining liability range of $3.1 million to $4.1 million continues to represent the Company's best estimate of the remaining potential obligation at December 31, 2013.