Schedule of Intangible Assets Recognized in Connection with Product Acquisitions (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Beginning Balance	$ 186,583	$ 180,950	$ 121,433
Additions	25,368	16,429	68,327
Write offs	(264)
Impact of movement in exchange rates	(1,158)	(45)	(6)
Amortization expense	(12,152)	(10,751)	(8,804)
Ending Balance	198,377	186,583	180,950
Goodwill at December 31, 2018	25,790	22,184
Net additions during fiscal 2019	22,652
Impact of movement in exchange rates	(1,885)
Goodwill at December 31, 2019	46,557	25,790	$ 22,184
Intangible assets and goodwill at Year End	$ 244,934	$ 212,373

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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