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Amount of Outstanding Debt and Notional Amount on Interest Rate Swap Contract (Detail) - Interest Rate Swap - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Outstanding Variable Rate Debt $ 69,000 $ 99,400 $ 51,550
Notional Amount on Interest Rate Swap     $ 36,750