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Schedule II - Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 183,000 $ 198,000 $ 292,000
Charge to Costs and Expenses 18,000 66,000 255,000
Other Charges, Deductions (30,000) (81,000) (349,000)
Balance at End of Period $ 171,000 $ 183,000 $ 198,000