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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      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 7,821 $ 7,306 $ 7,402
Charged to costs and expenses 1,676 1,249 763
Deductions from reserves, net 1,308 734 859
Balance at end of year 8,189 7,821 7,306
Income Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 3,763 4,938 3,961
Charged to costs and expenses 1,390 0 977
Deductions from reserves, net 0 1,175 0
Balance at end of year $ 5,153 $ 3,763 $ 4,938