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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
9 Months Ended
Oct. 26, 2015
Oct. 15, 2015
Feb. 20, 2015
Sep. 30, 2015
Jul. 13, 2015
Dec. 31, 2014
Derivative [Line Items]            
Notional Amount       $ 228,686,000   $ 181,119,000
Senior unsecured term loan facility     $ 50,000,000      
Subsequent Event [Member]            
Derivative [Line Items]            
Senior unsecured term loan facility interest rate   2.00%        
Interest Rate Caps [Member]            
Derivative [Line Items]            
Notional Amount       $ 171,546,000   $ 180,434,000
Interest Rate Caps [Member] | Subsequent Event [Member]            
Derivative [Line Items]            
Notional Amount $ 75,000,000          
Fixed rate interest rate swap, Maturity date Oct. 15, 2017          
Interest rate cap agreement, strike price 1.25%          
Interest rate cap agreement, premium $ 100,000          
One-month LIBOR [Member] | Interest Rate Swap Agreement Maturing on February 20, 2020 [Member]            
Derivative [Line Items]            
Notional Amount     $ 50,000,000      
Fixed rate interest rate swap     2.00%      
Fixed rate interest rate swap, agreement date       Feb. 20, 2015    
Fixed rate interest rate swap, Maturity date       Feb. 20, 2020    
Fixed rate interest rate swap, Effective date       Mar. 01, 2016    
One-month LIBOR [Member] | Interest Rate Swap Agreement Maturing on April 5, 2018 [Member]            
Derivative [Line Items]            
Notional Amount         $ 6,500,000  
Fixed rate interest rate swap         3.05%  
Fixed rate interest rate swap, agreement date       Jul. 13, 2015    
Fixed rate interest rate swap, Maturity date       Apr. 05, 2018    
Fixed rate interest rate swap, Effective date       Jul. 13, 2015    
LIBOR [Member] | Minimum [Member] | Senior Unsecured Term Loan Facility [Member]            
Derivative [Line Items]            
Senior unsecured term loan facility interest rate     1.35%      
LIBOR [Member] | Maximum [Member] | Senior Unsecured Term Loan Facility [Member]            
Derivative [Line Items]            
Senior unsecured term loan facility interest rate     1.95%