Goodwill and Other Intangible Assets - Components of Other Intangible Assets and Changes in Gross Carrying Values (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	$ 27,389	$ 27,441
Other Finite-Lived Intangible Assets, Accumulated Amortization	6,586	3,772
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	6,947	6,947
Other Finite-Lived Intangible Assets, Accumulated Amortization	2,096	1,498
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	4,087	4,087
Other Finite-Lived Intangible Assets, Accumulated Amortization	748	345
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	8,082	8,094
Other Finite-Lived Intangible Assets, Accumulated Amortization	1,871	1,098
Know-how [Member]
Finite-Lived Intangible Assets [Line Items]
Other Finite-Lived Intangible Assets, Gross Carrying Value	8,273	8,313
Other Finite-Lived Intangible Assets, Accumulated Amortization	$ 1,871	$ 831