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Contract Assets and Liabilities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Contract assets $ 0 $ 0
Contract with customer, contract duration 1 year  
Deferred revenue recognized $ 69,900,000 58,100,000
Revenue expected to be recognized 343,600,000  
Amortization expense related to deferred commissions $ 8,100,000 $ 7,200,000
Maximum [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Contract with customer, expected payment term one year