Intangible Assets Other Than Goodwill and Trademarks (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	$ 275,641	$ 228,885
Patents And Other
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	19,573	15,561
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	$ 256,068	$ 213,324