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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Net balance at January 1	$ 422,185,000	$ 333,276,000
Additions (Note 13)	0	74,453,000
Goodwill, Impairment Loss	0	0	$ 0
Disposal Group, Including Discontinued Operation, Goodwill		0
Currency translation	(8,020,000)	14,456,000
Net balance at December 31	413,640,000	$ 422,185,000	$ 333,276,000
Sordin
Goodwill [Roll Forward]
Goodwill, Impairment Loss	$ 525,000

X

- Definition

Amount classified as goodwill attributable to disposal group held for sale or disposed of.

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