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Schedule II, 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 Beginning of Year $ 6,004 $ 5,306 $ 4,131
Charged to Costs and Expenses 4,501 4,302 3,349
Deductions (5,582) (3,604) (2,174)
Balance at End of Year 4,923 6,004 5,306
Valuation allowance on deferred taxes      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 18,991 16,802 171,062
Charged to Costs and Expenses 517 2,189 0
Deductions (2,335) 0 (154,260)
Balance at End of Year $ 17,173 $ 18,991 $ 16,802