Goodwill, In-Process Research and Development and Other Intangible Assets, Net - Summary of Carrying Value of In-Process Research and Development Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Intangible Liability Disclosure [Abstract]
Carrying value of in-process research and development assets	$ 32,850	$ 32,850