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Mortgage Indebtedness - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
May. 09, 2016
Apr. 30, 2016
Sep. 17, 2015
May. 31, 2016
Apr. 30, 2016
Mar. 31, 2016
Feb. 29, 2016
Jan. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items]                      
Effective interest rate           3.60%     3.60%   3.70%
Mortgage indebtedness, outstanding principal           $ 948,521,000     $ 948,521,000   $ 975,531,000
Cash paid for interest                 9,151,000 $ 4,199,000  
Secured credit facility borrowing capacity           325,000,000     $ 325,000,000   $ 325,000,000
Key Bank Senior Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Repayments Of Lines Of Credit             $ 23,784,000 $ 23,784,000      
Line of Credit Drew Down           45,476,000          
Key Bank Interim Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Repayments Of Lines Of Credit           6,000,000          
Line of Credit Drew Down           $ 8,000,000          
Key Bank Interim Facility | Subsequent Event                      
Mortgage Loans On Real Estate [Line Items]                      
Repayments Of Lines Of Credit $ 18,400,000 $ 11,600,000                  
Secured Credit Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Effective interest rate           2.90% [1]     2.90% [1]   2.90% [2]
Mortgage indebtedness, outstanding principal           $ 324,977,000 [1]     $ 324,977,000 [1]   $ 271,500,000 [2]
Secured Credit Facility | Key Bank Senior Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Secured credit facility borrowing capacity     $ 325,000,000                
Secured Credit Facility | Key Bank Senior Facility | Limited Partner                      
Mortgage Loans On Real Estate [Line Items]                      
Secured credit facility, maturity date     Sep. 17, 2018                
Increase in maximum borrowing capacity     $ 450,000,000                
Secured Credit Facility | 1-month LIBOR | Key Bank Senior Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Debt instrument interest rate                 2.45%    
Senior Interim Term Loan | Key Bank Interim Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Secured credit facility borrowing capacity     $ 120,000,000                
Secured credit facility, maturity date     Sep. 16, 2016                
Senior Interim Term Loan | Key Bank Interim Facility | Limited Partner                      
Mortgage Loans On Real Estate [Line Items]                      
Percentage of net proceeds from equity issuances, sales of assets, refinancing of assets     100.00%                
Senior Interim Term Loan | 1-month LIBOR | Key Bank Interim Facility                      
Mortgage Loans On Real Estate [Line Items]                      
Debt instrument interest rate                 5.00%    
Sponsor                      
Mortgage Loans On Real Estate [Line Items]                      
Cash paid for interest                 $ 265,000 $ 238,000  
Mortgages-Floating Rate                      
Mortgage Loans On Real Estate [Line Items]                      
Effective interest rate           2.80%     2.80%   2.80%
Mortgage indebtedness, outstanding principal           $ 38,075,000     $ 38,075,000   $ 38,075,000
Mortgages-Floating Rate | Scenario, Forecast                      
Mortgage Loans On Real Estate [Line Items]                      
Repayment of mortgage indebtedness as part of a property disposition       $ 27,500,000              
Mortgages-Floating Rate | Subsequent Event                      
Mortgage Loans On Real Estate [Line Items]                      
Repayment of mortgage indebtedness as part of a property disposition         $ 10,575,000            
Mortgages-Fixed Rate                      
Mortgage Loans On Real Estate [Line Items]                      
Effective interest rate           3.80%     3.80%   3.80%
Mortgage indebtedness, outstanding principal           $ 495,253,000     $ 495,253,000   $ 545,956,000
Repayment of mortgage indebtedness as part of a property disposition             $ 6,659,000        
Weighted Average                      
Mortgage Loans On Real Estate [Line Items]                      
Effective interest rate           3.70%     3.70%    
Maximum | Senior Interim Term Loan | Key Bank Interim Facility | Limited Partner                      
Mortgage Loans On Real Estate [Line Items]                      
Principal amount outstanding     $ 100,000,000                
[1] The secured credit facility total capacity is $325.0 million, of which $325.0 million was outstanding as of March 31, 2016.
[2] The secured credit facility total capacity was $325.0 million, of which $271.5 million was outstanding as of December 31, 2015.