Intangibles, Net - Schedule of Intangibles, Net (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 160,422	$ 161,693
Accumulated amortization	137,933	134,502
Net	22,489	27,191
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	13,540	13,540
Accumulated amortization	6,480	5,116
Net	$ 7,060	8,424
Amortization Method	Straight-line
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 104,102	105,373
Accumulated amortization	90,543	88,931
Net	$ 13,559	16,442
Amortization Method	Accelerated
Other Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 42,780	42,780
Accumulated amortization	40,910	40,455
Net	$ 1,870	$ 2,325
Amortization Method	Straight-line