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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 5,540 $ 5,610 $ 8,189
Charged to costs and expenses (2) 375 1,649 1,471
Deductions from reserves, net 546 1,719 4,050
Balance at end of year 5,369 5,540 5,610
Income Tax Valuation Allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 4,559 5,303 5,153
Charged to costs and expenses (2) 859 906 3,095
Deductions from reserves, net 379 1,650 2,945
Balance at end of year $ 5,039 $ 4,559 $ 5,303