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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 8,189 $ 7,821 $ 7,306
Charged to costs and expenses 1,471 1,676 1,249
Deductions from reserves, net 4,050 1,308 734
Balance at end of year 5,610 8,189 7,821
Income Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 5,153 3,763 4,938
Charged to costs and expenses 150 1,390 0
Deductions from reserves, net 0 0 1,175
Balance at end of year $ 5,303 $ 5,153 $ 3,763