Gross Carrying Amount and Accumulated Amortization of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Amount	$ 3,332,070	$ 3,316,835
Gross Amount	3,387,470	3,370,935
Definite-lived intangible assets, Accumulated Amortization	1,807,077	1,599,573
Definite-lived intangible assets, Net Book Value	1,524,993	1,717,262
Net Book Value	1,580,393	1,771,362
Indefinite-lived intangible assets, Gross Amount	55,400	54,100
Indefinite-lived intangible assets	55,400	54,100
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Amount	55,400
Indefinite-lived intangible assets	55,400
In-process Research and Development
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Amount		54,100
Indefinite-lived intangible assets		54,100
Customer relationships
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Amount	1,761,898	1,672,470
Definite-lived intangible assets, Accumulated Amortization	866,141	780,655
Definite-lived intangible assets, Net Book Value	895,757	891,815
Developed technology, patents & licenses
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Amount	1,479,200	1,521,893
Definite-lived intangible assets, Accumulated Amortization	873,420	771,200
Definite-lived intangible assets, Net Book Value	605,780	750,693
Trademarks and Trade Names
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Amount	75,672	87,472
Definite-lived intangible assets, Accumulated Amortization	53,016	41,885
Definite-lived intangible assets, Net Book Value	22,656	45,587
Backlog
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Amount	15,300	35,000
Definite-lived intangible assets, Accumulated Amortization	14,500	5,833
Definite-lived intangible assets, Net Book Value	$ 800	$ 29,167