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Schedule II - Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 292,000 $ 266,000 $ 309,000
(Credit) Charge to Costs and Expenses 255,000 37,000 18,000
Other Charges, Deductions (349,000) (11,000) (61,000)
Balance at End of Period $ 198,000 $ 292,000 $ 266,000