Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Additional Information (Detail)

v3.6.0.2
Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Oct. 05, 2015
USD ($)
Aug. 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
property
mortgage
lender
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Number of properties collateralized in mortgage notes payable | property     94  
Net book value of collateralized mortgage properties     $ 5,900,000  
Number of long-term mortgages issued | mortgage     7  
Number of properties to issue collateralized mortgage notes payable | mortgage     12  
Number of mortgages repaid | mortgage     7  
Number of properties collateralized | mortgage     16  
Extension period subject to payment of fee 1 year      
Fair value of mortgage notes payable outstanding     $ 445,400,000  
Carrying value of debt     509,395,000 $ 525,332,000
Line of credit facility, maximum borrowing capacity   $ 100,000,000.0 $ 150,000,000.0  
Term of extended period   1 year    
Basis spread reduction (as percent)     0.25%  
Number of lenders added | lender     3  
Cost for modification of the credit facility agreement     $ 500,000  
Borrowings under revolving credit facility, net     $ 39,225,000 44,591,000
Line of credit at an interest rate (as percent)     3.00%  
Letters of credit, outstanding     $ 800,000  
Weighted average interest rate on debt outstanding (as percent)     4.48%  
5-Year Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 25,000,000.0  
Basis spread reduction (as percent)     0.05%  
Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 85,000,000.0      
Borrowings under revolving credit facility, net     $ 64,700,000  
Line of credit facility, maximum additional amount drawn     $ 30,800,000  
Line of Credit [Member] | 5-Year Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 25,000,000.0      
Debt instrument term     5 years  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Weighted average interest rate on debt outstanding (as percent)     2.25%  
Mortgage Notes Payable [Member]        
Debt Instrument [Line Items]        
Number of mortgage notes payable | mortgage     44  
Number of properties collateralized in mortgage notes payable | property     70  
Net book value of collateralized mortgage properties     $ 647,600,000  
Collateral     $ 8,900,000  
Collateral (as percent)     2.00%  
Carrying value of debt     $ 445,278,000 $ 455,863,000
Weighted average interest rate on debt outstanding (as percent)     4.69%