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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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