Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Carrying amount of goodwill, December 31, 2016	$ 414,936
Currency translation adjustments	1,761
Carrying amount of goodwill, March 31, 2017	416,697
Domestic
Goodwill [Roll Forward]
Carrying amount of goodwill, December 31, 2016	180,006
Currency translation adjustments	0
Carrying amount of goodwill, March 31, 2017	180,006
International
Goodwill [Roll Forward]
Carrying amount of goodwill, December 31, 2016	19,391
Currency translation adjustments	1,395
Carrying amount of goodwill, March 31, 2017	20,786
Proprietary Products
Goodwill [Roll Forward]
Carrying amount of goodwill, December 31, 2016	215,539
Currency translation adjustments	366
Carrying amount of goodwill, March 31, 2017	$ 215,905