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Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ (3,035) $ (5,755) $ (3,437)
Charged to Costs and Expenses (2,252)   (2,318)
Charged to Other Accounts 799 2,720  
Balance at End of Year (4,488) (3,035) (5,755)
Valuation Allowance of Deferred Tax Assets      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year (1,108) (1,916) (1,087)
Charged to Costs and Expenses     (829)
Charged to Other Accounts (357) 808  
Balance at End of Year (1,465) (1,108) (1,916)
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year (1,927) (3,839) (2,350)
Charged to Costs and Expenses (2,252)   (1,489)
Charged to Other Accounts 1,156 1,912  
Balance at End of Year $ (3,023) $ (1,927) $ (3,839)