Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Oct. 03, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets:
Goodwill	$ 25,308		$ 11,265	$ 11,502
Tebras And PBC [Member]
Assets:
Current assets		$ 5,165
Property, plant and equipment		5,716
Identifiable intangible assets		7,354
Goodwill		14,327
Total assets acquired		32,562
Liabilities:
Current liabilities		408
Deferred tax liability		3,079
Total liabilities assumed		3,487
Net assets acquired		$ 29,075