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Acquisitions - Summary of Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - SiriusDecisions, Inc [Member] $ in Thousands	Jan. 03, 2019 USD ($)
Business Acquisition [Line Items]
Intangible assets	$ 115,000
Intangible assets, Useful life	8 years 4 months 24 days
Technology Asset Class [Member]
Business Acquisition [Line Items]
Intangible assets	$ 13,000
Intangible assets, Useful life	3 years 2 months 12 days
Technology Asset Class [Member] | Minimum [Member]
Business Acquisition [Line Items]
Intangible assets, Useful life	1 year
Technology Asset Class [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible assets, Useful life	8 years
Backlog [Member]
Business Acquisition [Line Items]
Intangible assets	$ 13,000
Intangible assets, Useful life	2 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	$ 77,000
Intangible assets, Useful life	9 years 3 months
Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	$ 12,000
Intangible assets, Useful life	15 years 6 months

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

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