The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill And Identified Intangible Assets - Identified Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 683,896		$ 683,896		$ 681,061
Accumulated Amortization	(305,841)		(305,841)		(251,476)
Net	378,055		378,055		429,585
Intangible assets, gross	683,896		683,896		683,265
Intangible assets, net	378,055		378,055		431,789
Amortization expense	27,199	$ 28,151	54,365	$ 56,706
In-process research and development (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	0		0		2,204
Acquired patents / core technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	142,934		142,934		142,584
Accumulated Amortization	(121,275)		(121,275)		(113,349)
Net	21,659		$ 21,659		29,235
Acquired patents / core technology \| Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			3 years
Acquired patents / core technology \| Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			15 years
Existing technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	206,879		$ 206,879		204,394
Accumulated Amortization	(78,689)		(78,689)		(61,518)
Net	128,190		$ 128,190		142,876
Existing technology \| Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			5 years
Existing technology \| Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			10 years
Customer contracts and related relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	291,769		$ 291,769		291,769
Accumulated Amortization	(95,049)		(95,049)		(68,267)
Net	196,720		$ 196,720		223,502
Customer contracts and related relationships \| Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			3 years
Customer contracts and related relationships \| Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			9 years
Trademarks/trade name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	40,083		$ 40,083		40,083
Accumulated Amortization	(8,597)		(8,597)		(6,111)
Net	31,486		$ 31,486		33,972
Trademarks/trade name \| Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			4 years
Trademarks/trade name \| Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			10 years
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)			1 year
Finite-lived intangible assets, gross	2,231		$ 2,231		2,231
Accumulated Amortization	(2,231)		(2,231)		(2,231)
Net	$ 0		$ 0		$ 0