Goodwill and Intangible Assets - Summary of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Intangible Assets [Line Items]
Gross amounts of finite-lived intangible assets	$ 318,080	$ 296,357
Finite-lived intangible assets, Accumulated Amortization	(46,655)	(7,044)
Finite-lived intangible assets, Other	3,245
Finite-lived intangible assets, Net Carrying Amount	274,670	289,313
Indefinite-lived intangible assets, Net Carrying Amount	86,832	86,832
Gross amounts of intangible assets	404,912	383,189
Intangible Assets, Net Carrying Amount	361,502	376,145
IPR&D [Member]
Acquired Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net Carrying Amount	86,832	86,832
Developed Technology [Member]
Acquired Intangible Assets [Line Items]
Gross amounts of finite-lived intangible assets	125,889	113,361
Finite-lived intangible assets, Accumulated Amortization	(19,317)	(1,740)
Finite-lived intangible assets, Other	1,847
Finite-lived intangible assets, Net Carrying Amount	108,419	111,621
Trade name [Member]
Acquired Intangible Assets [Line Items]
Gross amounts of finite-lived intangible assets	45,275	43,500
Finite-lived intangible assets, Accumulated Amortization	(10,924)	(967)
Finite-lived intangible assets, Other	261
Finite-lived intangible assets, Net Carrying Amount	34,612	42,533
Favorable Contracts and Leases Net [Member]
Acquired Intangible Assets [Line Items]
Gross amounts of finite-lived intangible assets	112,817	112,817
Finite-lived intangible assets, Accumulated Amortization	(8,639)	(864)
Finite-lived intangible assets, Net Carrying Amount	104,178	111,953
Other [Member]
Acquired Intangible Assets [Line Items]
Gross amounts of finite-lived intangible assets	34,099	26,679
Finite-lived intangible assets, Accumulated Amortization	(7,775)	(3,473)
Finite-lived intangible assets, Other	1,137
Finite-lived intangible assets, Net Carrying Amount	$ 27,461	$ 23,206