Revenues and Accounts Receivable - Additional Information (Detail1) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Revenue remaining performance obligations	$ 24.4	$ 13.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Accounts Notes And Loans Receivable [Line Items]
Revenue remaining performance obligations	$ 23.7
Revenue remaining performance obligations, satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Accounts Notes And Loans Receivable [Line Items]
Revenue remaining performance obligations	$ 0.7
Revenue remaining performance obligations, satisfaction period