General - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of operating segments	1
Number of Reportable segment	1
Trade receivables \| $	$ 203.0	$ 207.9
Credit Concentration Risk \| Revenue
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	37.00%	36.00%	36.00%
Credit Concentration Risk \| Revenue \| First Channel Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	18.00%	17.00%	18.00%
Credit Concentration Risk \| Revenue \| Second Channel Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	19.00%	19.00%	18.00%

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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