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Derivative Financial Instruments - Summary of Aggregate Amount and Estimated Net Fair Value of Derivative Instruments (Detail) - USD ($)
Dec. 31, 2016
Jun. 24, 2016
Dec. 31, 2015
Sep. 30, 2015
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount $ 350,000,000   $ 200,000,000  
Derivative assets, Estimated Fair Value 3,867,000   24,000  
Fair Value of Assets 3,867,000      
Fair Value of Assets     24,000  
Interest Rate Swap        
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount 150,000,000      
Cash Flow Hedge        
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount 150,000,000   200,000,000  
Fair Value of Assets 3,867,000   24,000  
Cash Flow Hedge | Interest Rate Swap        
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount 150,000,000 $ 150,000,000    
Fair Value of Assets 3,867,000      
Cash Flow Hedge | Interest Rate Cap        
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount     200,000,000 $ 200,000,000
Fair Value of Assets     $ 24,000  
Freestanding Derivatives | Interest Rate Cap        
Derivative Instruments Gain Loss [Line Items]        
Derivative, notional amount $ 200,000,000