Acquisitions - Narrative (Details) (USD $)	12 Months Ended			1 Months Ended				1 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended							1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 31, 2012 Palsticos Novel S.A. [Member]	Jul. 31, 2011 Palsticos Novel S.A. [Member]	Jul. 09, 2012 Palsticos Novel S.A. [Member]	Oct. 02, 2012 Jamco [Member]	Jul. 31, 2011 Material Improvements L.P. [Member]	Dec. 31, 2012 Material Improvements L.P. [Member]	Dec. 31, 2011 Material Improvements L.P. [Member]	Jul. 21, 2010 Enviro-Fill Inc. [Member]	Dec. 31, 2012 Developed Technology Rights [Member]	Jul. 09, 2012 Developed Technology Rights [Member] Palsticos Novel S.A. [Member]	Dec. 31, 2012 Customer Relationships [Member]	Jul. 09, 2012 Customer Relationships [Member] Palsticos Novel S.A. [Member]	Oct. 02, 2012 Customer Relationships [Member] Jamco [Member]	Oct. 02, 2012 Technology [Member] Jamco [Member]	Dec. 31, 2011 Technology [Member] Material Improvements L.P. [Member]	Oct. 02, 2012 Noncompete Agreements [Member] Jamco [Member]	Dec. 31, 2011 Trade Names [Member] Material Improvements L.P. [Member]	Oct. 31, 2012 Customer Relationships [Member] Jamco [Member]	Oct. 31, 2012 Noncompete Agreements [Member] Jamco [Member]	Oct. 31, 2012 Technology [Member] Jamco [Member]	Jul. 09, 2012 Trade Names [Member] Palsticos Novel S.A. [Member]	Oct. 02, 2012 Trade Names [Member] Jamco [Member]
Business Acquisition [Line Items]
Percentage of acquired entity				100.00%			100.00%
Purchase price of business						$ 31,000,000	$ 15,100,000	$ 5,700,000			$ 1,500,000
Accounts receivable						5,467,000	1,690,000
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents						630,000	88,000
Cash				630,000
Acquired Indefinite-lived Intangible Asset, Amount																									1,200,000
Acquired Finite-lived Intangible Asset, Amount																2,400,000	2,000,000		100,000
Weighted Average Useful Life (years)												10 years		6 years							6 years	2 years	10 years
Debt assumed in connection with acquisition						26,028,000	0
Contingent consideration in connection with acquisition						900,000			4,600,000
Contingent Consideration, Contingency Period					4 years
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									1,000,000
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment										300,000
Indefnite lived intangible assets acquired in connection with acquisition																								1,600,000
Intangibles						5,790,000	5,680,000				800,000		1,800,000		2,400,000			1,300,000		200,000
Cash paid to acquire business	18,543,000	1,100,000	411,000	3,400,000				1,100,000
Property, plant & equipment						13,636,000	2,559,000
Goodwill	$ 61,056,000	$ 44,666,000	$ 40,892,000			$ 8,805,000	$ 7,435,000			$ 3,900,000	$ 700,000