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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Beginning balance [1] $ 49,748 $ 47,545 $ 150,384
Valuation allowance, Additions/Charges to Expense [1] 2,146 4,219 (109,805)
Valuation allowance, Deductions/ Other [1] (1,375) (2,016) 6,966
Valuation allowance, Ending balance [1] 50,519 49,748 47,545
Valuation Allowance for Accounts Receivable [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Beginning balance 23,142 20,229 19,097
Valuation allowance, Additions/Charges to Expense 27,571 32,049 22,212
Valuation allowance, Deductions/ Other (28,179) (29,136) (21,080)
Valuation allowance, Ending balance $ 22,534 $ 23,142 $ 20,229
[1] Amounts include both continuing and discontinued operations gross deferred tax balances.