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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Beginning balance [1] $ 50,519 $ 49,748 $ 47,545
Valuation allowance, Additions/Charges to Expense [1]   2,146 4,219
Valuation allowance, Deductions/ Other [1] (2,482) (1,375) (2,016)
Valuation allowance, Ending balance [1] 48,037 50,519 49,748
Valuation Allowance for Accounts Receivable [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Beginning balance 22,534 23,142 20,229
Valuation allowance, Additions/Charges to Expense 32,042 27,571 32,049
Valuation allowance, Deductions/ Other (29,740) (28,179) (29,136)
Valuation allowance, Ending balance $ 24,836 $ 22,534 $ 23,142
[1] Amounts include both continuing and discontinued operations gross deferred tax balances.