Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Mar. 31, 2012 Robuschi S.P.A.
Goodwill and Intangible Assets Disclosure [Line Items]
Increase in goodwill related to acquisitions associated with the valuation of Robuschi					$ 112,221,000
Amortization of intangible assets	4,119,000	3,869,000	15,933,000	12,720,000		3,400,000
Anticipated amortization of intangible assets, remainder of fiscal year	20,200,000		20,200,000
Anticipated amortization of intangible assets in 2013	16,700,000		16,700,000
Anticipated amortization of intangible assets in 2014	16,700,000		16,700,000
Anticipated amortization of intangible assets in 2015	16,700,000		16,700,000
Anticipated amortization of intangible assets in 2016	$ 16,700,000		$ 16,700,000