Goodwill and Other Intangible Assets - Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Intangible Assets, Gross Amount [Roll Forward]
Other intangible assets, beginning	$ 138,831	$ 124,093
Intangible assets acquired during the period	284,000	20,779
Currency translation effect on foreign balances	(2,285)	(6,041)
Other intangible assets, ending	420,546	138,831
Other Intangible Assets, Accumulated Amortization [Roll Forward]
Other intangible assets, beginning	(33,728)	(23,158)
Amortization expense	(16,549)	(12,136)
Currency translation effect on foreign balances	1,147	1,566
Other intangible assets, ending	$ (49,130)	$ (33,728)