Goodwill and Other Intangible Assets - Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gross Amount
Other intangible assets, beginning	$ 423,846	$ 420,546
Intangible assets acquired, purchase accounting adjustment	557,390
Intangible assets acquired during the period		(461)
Impairment	0	(3,657)
Currency translation effect on foreign balances	(2,924)	7,418
Other intangible assets, ending	964,653	423,846
Finite-Lived Intangible Assets, Disposal of Intangible Assets	(13,659)
Amortization of Intangible Assets, Adjustment for Disposal	13,659
Accumulated Amortization
Other intangible assets, beginning	(76,634)	(49,130)
Amortization expense	(32,927)	(25,855)
Impairment	0	1,987
Currency translation effect on foreign balances	1,766	(3,636)
Other intangible assets, ending	$ (94,136)	$ (76,634)