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Valuation And Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at the beginning of the period $ 4,190 $ 3,181 $ 3,825
Additions [1] 1,912 2,269 224
Deduction (613) (1,260) (868)
Balance at the end of the period 5,489 4,190 3,181
Valuation Allowance of Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at the beginning of the period 1,015 832 1,984
Additions [1] 492 183 20
Deduction 0 0 (1,172)
Balance at the end of the period $ 1,507 $ 1,015 $ 832
[1] Reductions in/charges to revenues and expenses.