Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Intangible Assets By Major Class [Line Items]
Gross	$ 179,502		$ 128,152
Accumulated Amortization	39,479		39,421
Net Book Value	140,023		88,731
Aggregate amortization expense on intangible assets	58	$ 13
Patents
Intangible Assets By Major Class [Line Items]
Gross	31,581		31,581
Accumulated Amortization	31,453		31,440
Net Book Value	$ 128		141
Patents | Minimum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	2 years
Patents | Maximum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	16 years
Developed technology and other
Intangible Assets By Major Class [Line Items]
Gross	$ 9,631		7,981
Accumulated Amortization	8,026		7,981
Net Book Value	$ 1,605		0
Developed technology and other | Minimum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	1 year
Developed technology and other | Maximum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	9 years
Trade name, trademark and trade dress and other
Intangible Assets By Major Class [Line Items]
Gross	$ 138,290		88,590
Net Book Value	$ 138,290		$ 88,590