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Derivative Instruments and Hedging Activities - Additional Information (Detail)
Jun. 30, 2015
USD ($)
Instruments
Derivative
Jun. 30, 2014
USD ($)
Derivative
Derivative [Line Items]    
Estimated net fair value of derivatives $ (8,717,000) $ (975,000)
Asset position 794,000 1,800,000
Liability position 9,500,000 2,800,000
Counter Party [Member]    
Derivative [Line Items]    
Derivative asset, collateral, Obligation to return cash, offset $ 8,700,000 $ 1,090,000
Other Assets [Member]    
Derivative [Line Items]    
Number of interest rate derivative instruments held | Derivative 2 3
Other Liabilities [Member]    
Derivative [Line Items]    
Number of interest rate derivative instruments held | Derivative 8 4
Estimated net fair value of derivatives $ (8,717,000) $ (975,000)
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Number of interest rate derivative instruments held | Instruments 8  
Estimated net fair value of derivatives $ (9,511,000) (2,714,000)
Interest Rate Swaps [Member] | Other Liabilities [Member]    
Derivative [Line Items]    
Estimated net fair value of derivatives $ (9,511,000) (2,714,000)
Interest Rate Caps [Member]    
Derivative [Line Items]    
Number of interest rate derivative instruments held | Instruments 2  
Estimated net fair value of derivatives $ 794,000 1,739,000
Interest Rate Caps [Member] | Other Liabilities [Member]    
Derivative [Line Items]    
Estimated net fair value of derivatives $ 794,000 $ 1,739,000