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Subsequent Events - Additional Information (Detail)		12 Months Ended
	Jan. 03, 2019 USD ($) Employee	Dec. 31, 2018 USD ($)
Subsequent Event [Line Items]
Net cash paid		$ 9,250,000
Subsequent Event [Member] | Term Loans [Member]
Subsequent Event [Line Items]
Senior secured term loans	$ 125,000,000
Subsequent Event [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Line of credit facility current borrowing capacity	$ 50,000,000
SiriusDecisions, Inc [Member]
Subsequent Event [Line Items]
Business combination acquisition and integration cost		$ 1,800,000
SiriusDecisions, Inc [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of issued and outstanding shares acquired	100.00%
Number of employees | Employee	350
Consideration paid at closing	$ 247,300,000
Purchase price consideration	245,000,000
Cash acquired	7,200,000
Net cash paid	240,100,000
Credit facility, maximum borrowing capacity amount	$ 200,000,000
Percentage of voting equity of subsidiaries	65.00%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Term Loans [Member]
Subsequent Event [Line Items]
Senior secured term loans	$ 125,000,000
Debt instrument maturity date	Jan. 03, 2024
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 75,000,000
Credit facility maturity date	Jan. 03, 2024
Percentage of commitment fee on the unused portion of the facility	0.35%
Line of credit facility unused capacity commitment fee percentage	0.30%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Letters of Credit [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Available for issuance of letter of credit	$ 5,000,000
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Minimum [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Interest rate	1.75%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Minimum [Member] | Base Rate [Member]
Subsequent Event [Line Items]
Interest rate	0.75%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Line of credit facility unused capacity commitment fee percentage	0.25%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Increase (decrease) in line of credit facility	$ 50,000,000
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Maximum [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Interest rate	2.50%
SiriusDecisions, Inc [Member] | Subsequent Event [Member] | Maximum [Member] | Base Rate [Member]
Subsequent Event [Line Items]
Interest rate	1.50%

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