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Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jan. 03, 2019	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Amortization of intangible assets		$ 6,210	$ 186
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 116,000
Acquired intangible assets, Useful life	8 years 3 months 18 days
Amortization of intangible assets		$ 6,000
SiriusDecisions, Inc [Member] | Technology Asset Class [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 14,000
Acquired intangible assets, Useful life	2 years 10 months 24 days
SiriusDecisions, Inc [Member] | Technology Asset Class [Member] | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	1 year
SiriusDecisions, Inc [Member] | Technology Asset Class [Member] | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	8 years
SiriusDecisions, Inc [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 77,000
Acquired intangible assets, Useful life	9 years 3 months
SiriusDecisions, Inc [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 12,000
Acquired intangible assets, Useful life	15 years 6 months
SiriusDecisions, Inc [Member] | Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 13,000
Acquired intangible assets, Useful life	2 years

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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

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