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Schedule V - Valuation Allowances and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 357 $ 446 $ 530
Charges to Earnings 395 431 428
Deductions 408 520 512
Ending Balance $ 344 $ 357 $ 446