Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Intangible Assets By Major Class [Line Items]
Gross	$ 531,661	$ 265,725
Accumulated Amortization	44,612	41,033
Net Book Value	487,049	224,692
Patents
Intangible Assets By Major Class [Line Items]
Gross	31,581	31,581
Accumulated Amortization	31,581	31,543
Net Book Value	$ 0	38
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
Other Intangible Assets
Intangible Assets By Major Class [Line Items]
Gross	$ 52,837	15,780
Accumulated Amortization	13,031	9,490
Net Book Value	$ 39,806	6,290
Other Intangible Assets | Minimum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	1 year
Other Intangible Assets | Maximum
Intangible Assets By Major Class [Line Items]
Useful Life (years)	10 years
Trade name, trademark and trade dress and other
Intangible Assets By Major Class [Line Items]
Gross	$ 447,243	218,364
Net Book Value	$ 447,243	$ 218,364