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Valuation And Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at the beginning of the period $ 4,412 $ 3,989 $ 4,366
Additions [1] 884 2,969 2,281
Deduction (1,471) (2,546) (2,658)
Balance at the end of the period 3,825 4,412 3,989
Valuation Allowance of Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at the beginning of the period 2,311 77 231
Additions [1] 75 2,234 77
Deduction (402) 0 (231)
Balance at the end of the period $ 1,984 $ 2,311 $ 77
[1] Reductions in/charges to revenues and expenses.