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Recent Accounting Standards - Additional Information (Detail) - ASU 2014-09 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Capitalized cost amortization period 3 years    
Estimated increase in beginning retained earnings balance     $ 13.0
Estimated decrease in beginning gross deferred revenues     13.0
Estimated decrease in beginning deferred tax assets, net of deferred tax liabilities     5.0
Estimated Increase in beginning other non-current assets     4.0
Estimated increase in beginning other current assets     $ 1.0
Estimated (decrease) increase in product license revenues $ (0.5) $ 1.5  
Estimated increase in net accounts receivable 95.9 101.5  
Estimated increase in net deferred revenues 95.9 101.5  
Estimated variable compensation expenses capitalized 2.5 3.0  
Estimated increase (decrease) in provision for income taxes $ (1.5) $ 0.5