Goodwill and Other Intangible Assets, Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense	$ 6.6	$ 5.5	$ 3.2
Expected amortization expense in 2013	9.5
Expected amortization expense in 2014	9.5
Expected amortization expense in 2015	9.5
Expected amortization expense in 2016	9.5
Expected amortization expense in 2017	9.5
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired definite-lived intangibles	69.6
Definite-lived intangibles, weighted-average useful life (in years)	18 years
Technology Know-how
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired definite-lived intangibles	$ 11.0
Other definite-lived intangibles
Goodwill and Intangible Assets Disclosure [Line Items]
Definite-lived intangibles, weighted-average useful life (in years)	9 years