Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Gross carrying Amount	$ 665,845	$ 463,869
Accumulated amortization	304,416	281,439
Net carrying value	361,429	182,430
Developed Technology
Finite-Lived Intangible Assets
Gross carrying Amount	246,610	206,224
Accumulated amortization	162,432	149,215
Net carrying value	84,178	57,009
Trademarks and Trade names
Finite-Lived Intangible Assets
Gross carrying Amount	25,655	16,807
Accumulated amortization	14,059	13,712
Net carrying value	11,596	3,095
Customer Relationships [Member]
Finite-Lived Intangible Assets
Gross carrying Amount	367,723	220,806
Accumulated amortization	119,049	110,281
Net carrying value	248,674	110,525
Other Intangible Assets [Member]
Finite-Lived Intangible Assets
Gross carrying Amount	25,857	20,032
Accumulated amortization	8,876	8,231
Net carrying value	$ 16,981	$ 11,801

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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