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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 851 $ 973 $ 1,391
Charged to Costs and Expenses 969 1,005 1,239
Charged to Other Accounts (8) (121) 51
Deductions from Reserves (619) (1,006) (1,708)
Balance at End of Period 1,193 851 973
Allowance for Deferred Income Tax Assets      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 9,977 27,578 19,304
Charged to Costs and Expenses 19,277   6,700
Charged to Other Accounts (491) (14,009) 1,574
Deductions from Reserves   (3,592)  
Balance at End of Period 28,763 9,977 27,578
Reserve for Inventory      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 6,270 7,887 4,790
Charged to Costs and Expenses 1,679 2,712 3,521
Charged to Other Accounts (56) (1,047) 302
Deductions from Reserves (1,820) (3,282) (726)
Balance at End of Period $ 6,073 $ 6,270 $ 7,887