Goodwill and Intangible Assets - Intangibles and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Total intangible assets, accumulated amortization	$ 66,229	$ 62,013
Total intangible assets, cost	220,912	158,082
Total intangible assets, net	154,683	96,069
Customer Relationships [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	164,406	112,408
Total intangible assets, accumulated amortization	60,761	56,677
Intangible assets subject to amortization, net	103,645	55,731
Product Technology and Patents [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	6,090	6,049
Total intangible assets, accumulated amortization	5,468	5,336
Intangible assets subject to amortization, net	622	713
Tradenames and Trademarks [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	$ 50,416	$ 39,625