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CREDIT AGREEMENT AND PRUDENTIAL LOAN AGREEMENT - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Feb. 25, 2013
Credit and Loan Agreement [Line Items]      
Credit agreement initiation date Feb. 25, 2013    
Senior secured revolving credit agreement $ 175,000,000    
Senior secured revolving credit agreement, maturity date Aug. 31, 2015    
Extension of credit agreement 1 year    
Total bank syndicate commitment allocated to term loan 25,000,000    
Total Bank Syndicate commitment allocated to a revolving facility 150,000,000    
Credit facility outstanding amount 34,000,000 58,000,000  
Amount of rate increase in case of default 2.00%    
Mortgaged properties, aggregate net book value 153,894,000 154,117,000  
Senior secured term loan, issuance date Feb. 25, 2013    
Senior secured term loan, amount     100,000,000
Senior secured term loan agreement, maturity date Feb. 28, 2021    
Interest rate on loan agreement 6.00%    
Amount of rate increase in case of default 2.00%    
Revolving Credit Facility [Member]
     
Credit and Loan Agreement [Line Items]      
Option to increase credit facility 50,000,000    
Credit facility amount 200,000,000    
Senior Secured Revolving Credit Facility And Senior Secured Term Loan Facility [Member]
     
Credit and Loan Agreement [Line Items]      
Aggregate maturity of credit agreement and term loan, year 2015 34,000,000    
Principal repayment of senior secured term loan in year eight 100,000,000    
Prudential Loan Agreement [Member]
     
Credit and Loan Agreement [Line Items]      
Fair value of borrowings outstanding 106,000,000    
Minimum [Member]
     
Credit and Loan Agreement [Line Items]      
Credit agreement margin on borrowing base rate 1.50%    
Annual commitment fee on undrawn funds 0.30%    
Maximum [Member]
     
Credit and Loan Agreement [Line Items]      
Credit agreement margin on borrowing base rate 2.00%    
Annual commitment fee on undrawn funds 0.40%    
Credit facility outstanding amount $ 34,000,000    
Interest rate 2.70%    
LIBOR [Member] | Minimum [Member]
     
Credit and Loan Agreement [Line Items]      
Credit agreement margin on borrowing base rate 2.50%    
LIBOR [Member] | Maximum [Member]
     
Credit and Loan Agreement [Line Items]      
Credit agreement margin on borrowing base rate 3.00%