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Summarized Information of Location and Gross Amount of Derivatives' Fair Value in Consolidated Balance Sheets (Detail) - Not Designated as Hedging Instrument - Interest Rate Swap - Other Liabilities - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Notional Amount $ 200,000 $ 200,000
Fair Value $ (11,801) $ (13,675)