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Revenue - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Revenue [Line Items]
Software licensing arrangements warranty, description		The Company's software license arrangements typically provide the customer with a standard 90-day assurance-type warranty.
Software licensing arrangements warranty period		90 days
Initial post contract customer support period		1 year
Percentage of receivables as of June 30, 2018 or December 31, 2017		No customer accounted for more than 10% of the Company's consolidated receivables balance as of September 30, 2018 or December 31, 2017.
Revenue allocated to remaining performance obligations	$ 599.9	$ 599.9
Percentage of revenue allocated to remaining performance obligations to be recognized over the next 12 months	48.00%	48.00%
Capitalized sales commissions minimum amortization period		1 year
Selling and Marketing [Member]
Revenue [Line Items]
Amortization of capitalized sales commissions	$ 2.1	$ 6.4
Cost of Revenue [Member]
Revenue [Line Items]
Amortization of capitalized contract costs	1.1	3.5
Other Current Assets [Member]
Revenue [Line Items]
Capitalized sales commissions	0.6	0.6
Capitalized contract costs, current	0.1	0.1
Other Noncurrent Assets [Member]
Revenue [Line Items]
Capitalized sales commissions	15.4	15.4
Capitalized contract costs, noncurrent	$ 12.6	$ 12.6

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