Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - In-Process Research and Development [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 15,920
Foreign currency translation impact	1,968
Ending balance	$ 17,888