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Revenue - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($)
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 June 30, 2018 or December 31, 2017.
Revenue allocated to remaining performance obligations | $ 586.1 | $ 586.1
Percentage of revenue allocated to remaining performance obligations to be recognized over the next 12 months | 47.00% | 47.00%
Capitalized sales commissions minimum amortization period |  | 1 year
Selling and Marketing [Member] |  |
Revenue [Line Items] |  |
Amortization of capitalized sales commissions | $ 2.0 | $ 4.3
Cost of Revenue [Member] |  |
Revenue [Line Items] |  |
Amortization of capitalized contract costs | 2.4 | 1.2
Other Current Assets [Member] |  |
Revenue [Line Items] |  |
Capitalized sales commissions | 0.3 | 0.3
Capitalized contract costs, current | 0.1 | 0.1
Other Noncurrent Assets [Member] |  |
Revenue [Line Items] |  |
Capitalized sales commissions | 17.5 | 17.5
Capitalized contract costs, noncurrent | $ 12.0 | $ 12.0

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