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Summary of Significant Accounting Policies - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Standard product warranty term 2 years    
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Beginning balance $ 9,636 $ 7,610 $ 6,657
Provision 7,926 8,311 9,437
Provision liability assumed from acquisition 0 2,208 0
Claims paid/costs incurred (8,198) (8,493) (8,484)
Ending balance $ 9,364 $ 9,636 $ 7,610