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Mortgage Indebtedness - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Sep. 17, 2015
Apr. 13, 2015
Jan. 27, 2015
Dec. 29, 2014
Dec. 08, 2014
Nov. 24, 2014
Oct. 24, 2014
Sep. 15, 2014
Jul. 15, 2014
May. 27, 2014
Mar. 31, 2014
Feb. 28, 2014
Feb. 07, 2014
Oct. 25, 2013
Feb. 29, 2016
Jan. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                                 3.70% 3.60%  
Mortgage indebtedness, outstanding principal                                 $ 975,531,000 $ 417,369,000  
Cash paid for interest                                 22,105,000 9,170,000 $ 3,545,000
Accrued interest payable outstanding                                 0    
Mortgage indebtedness, carrying amount                                 584,337,000 400,509,000  
Loans payable on real estate                                 359,495,000    
Fair value of debt assumed                                 371,256,000    
Secured credit facility borrowing capacity                                 $ 325,000,000 $ 30,000,000  
Key Bank Senior Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Pledge of collateral security for credit facility                                 85.00%    
Key Bank Senior Facility | Subsequent Event                                      
Mortgage Loans On Real Estate [Line Items]                                      
Repayments Of Lines Of Credit                             $ 9,684,000 $ 14,100,000      
Key Bank Senior Facility | Limited Partner | If greater than or equal to 50% of the revolver is used                                      
Mortgage Loans On Real Estate [Line Items]                                      
Percentage of fee on line of credit facility outstanding 0.20%                                    
Key Bank Senior Facility | Limited Partner | If less than 50% of the revolver is used                                      
Mortgage Loans On Real Estate [Line Items]                                      
Percentage of fee on line of credit facility outstanding 0.25%                                    
Revolving credit agreement | Key Bank Senior Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Secured credit facility borrowing capacity $ 125,000,000                                    
Percentage of secured credit facility available for swingline loans 10.00%                                    
Percentage of secured credit facility available for issuance of letters of credit 10.00%                                    
Revolving credit agreement | 1-month LIBOR                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate                           2.50%          
Secured Credit Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                                 2.90% [1] 2.70% [2]  
Mortgage indebtedness, outstanding principal                                 $ 271,500,000 [1] $ 18,392,000 [2]  
Secured Credit Facility | Key Bank Senior Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Secured credit facility borrowing capacity $ 325,000,000                                    
Deferred financing costs $ 4,722,000                                    
Secured credit facility, remaining borrowing capacity                                 $ 53,500,000    
Secured Credit Facility | Key Bank Senior Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Mortgage indebtedness maturity (in years) 3 years                                    
Increase in maximum borrowing capacity $ 450,000,000                                    
Secured credit facility, maturity date Sep. 17, 2018                                    
Secured Credit Facility | 1-month LIBOR | Key Bank Senior Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate                                 2.45%    
Term Loan | Key Bank Senior Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Secured credit facility borrowing capacity $ 200,000,000                                    
Secured credit facility, remaining borrowing capacity                                 $ 0    
Senior Interim Term Loan | Key Bank Interim Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Mortgage indebtedness maturity (in years) 364 days                                    
Secured credit facility borrowing capacity $ 120,000,000                                    
Deferred financing costs $ 2,092,000                                    
Secured credit facility, remaining borrowing capacity                                 $ 0    
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%    
Senior Interim Term Loan | 1-month LIBOR | Key Bank Interim Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 5.00%                                    
Senior Interim Term Loan | 1-month LIBOR | Key Bank Interim Facility | Limited Partner | If IROP elects to extend its maturity                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 6.50%                                    
Senior Interim Term Loan | Base Rate | Key Bank Interim Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 4.00%                                    
Senior Interim Term Loan | Base Rate | Key Bank Interim Facility | Limited Partner | If IROP elects to extend its maturity                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 5.50%                                    
Iron Rock Ranch                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate     3.40%                                
Mortgage indebtedness, carrying amount     $ 22,900,000                                
Interest payment period                                 Monthly    
Maturity date     Feb. 01, 2025                                
Stonebridge At The Ranch                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate   3.20%                                  
Mortgage indebtedness, carrying amount   $ 20,527,000                                  
Interest payment period                                 Monthly    
Maturity date   May 01, 2025                                  
Creekstone At R T P                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 3.90%                                    
Mortgage indebtedness, carrying amount $ 23,250,000                                    
Interest payment period                                 Monthly    
Maturity date Jun. 10, 2023                                    
Principal date Jun. 10, 2016                                    
Mortgage indebtedness maturity (in years) 30 years                                    
Fountains Southend                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 4.30%                                    
Mortgage indebtedness, carrying amount $ 23,750,000                                    
Interest payment period                                 Monthly    
Maturity date Feb. 05, 2024                                    
Principal date Feb. 05, 2017                                    
Mortgage indebtedness maturity (in years) 30 years                                    
I R T Millenia                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 3.80%                                    
Mortgage indebtedness, carrying amount $ 25,000,000                                    
Interest payment period                                 Monthly    
Maturity date Mar. 05, 2021                                    
Principal date Apr. 05, 2018                                    
Mortgage indebtedness maturity (in years) 30 years                                    
I R T Millenia | Supplemental Loan Agreement                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 4.30%                                    
Mortgage indebtedness, carrying amount $ 4,175,000                                    
Interest payment period                                 Monthly    
Maturity date Mar. 05, 2021                                    
Principal date May 05, 2018                                    
Mortgage indebtedness maturity (in years) 30 years                                    
Talison Row                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 4.10%                                    
Mortgage indebtedness, carrying amount $ 33,635,000                                    
Interest payment period                                 Monthly    
Maturity date Sep. 10, 2023                                    
Principal date Sep. 10, 2016                                    
Mortgage indebtedness maturity (in years) 30 years                                    
Aventine Greenville                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 3.20%                                    
Mortgage indebtedness, carrying amount $ 30,600,000                                    
Interest payment period                                 Monthly    
Maturity date Mar. 05, 2021                                    
Principal date Nov. 04, 2016                                    
Mortgage indebtedness maturity (in years) 30 years                                    
Waterstone at Brier Creek                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 3.70%                                    
Mortgage indebtedness, carrying amount $ 16,250,000                                    
Interest payment period                                 Monthly    
Maturity date Apr. 05, 2022                                    
Waterstone at Brier Creek | Supplemental Loan Agreement                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate 4.20%                                    
Mortgage indebtedness, carrying amount $ 4,175,000                                    
Interest payment period                                 Monthly    
Maturity date Apr. 05, 2022                                    
Stonebridge Crossing                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate       3.40%                              
Mortgage indebtedness, carrying amount       $ 19,370,000,000                              
Interest payment period                                 monthly    
Maturity date       Jan. 01, 2022                              
Prospect Park                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate         3.60%                            
Mortgage indebtedness, carrying amount         $ 9,230,000                            
Interest payment period                                 monthly    
Maturity date         Jan. 01, 2025                            
Brookside                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate         3.60%                            
Mortgage indebtedness, carrying amount         $ 13,455,000                            
Interest payment period                                 monthly    
Maturity date         Jan. 01, 2025                            
Jamestown                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate         3.60%                            
Mortgage indebtedness, carrying amount         $ 22,880,000                            
Interest payment period                                 monthly    
Maturity date         Jan. 01, 2025                            
Meadows                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate         3.60%                            
Mortgage indebtedness, carrying amount         $ 24,245,000                            
Interest payment period                                 monthly    
Maturity date         Jan. 01, 2025                            
Oxmoor                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate         3.60%                            
Mortgage indebtedness, carrying amount         $ 35,815,000                            
Interest payment period                                 monthly    
Maturity date         Jan. 01, 2025                            
Bennington Pond                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate           3.70%                          
Mortgage indebtedness, carrying amount           $ 11,375,000                          
Interest payment period                                 monthly    
Maturity date           Dec. 01, 2024                          
Lenoxplace                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate             3.70%                        
Mortgage indebtedness, carrying amount             $ 15,991,000                        
Interest payment period                                 monthly    
Maturity date             Nov. 01, 2021                        
Walnut Hill                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate               3.40%                      
Mortgage indebtedness, carrying amount               $ 18,650,000                      
Interest payment period                                 monthly    
Maturity date               Oct. 01, 2021                      
Arbors                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                 4.00%                    
Mortgage indebtedness, carrying amount                 $ 13,150,000                    
Interest payment period                                 monthly    
Maturity date                 Aug. 01, 2024                    
Carrington                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                 4.00%                    
Mortgage indebtedness, carrying amount                 $ 14,235,000                    
Interest payment period                                 monthly    
Maturity date                 Aug. 01, 2024                    
The Crossings                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                   3.90%                  
Mortgage indebtedness, carrying amount                   $ 15,313,000                  
Interest payment period                                 monthly    
Maturity date                   Jun. 01, 2024                  
King's Landing                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                     4.00%                
Mortgage indebtedness, carrying amount                     $ 21,200,000                
Interest payment period                                 monthly    
Maturity date                     Jun. 01, 2022                
Principal date                     Jun. 01, 2017                
Mortgage indebtedness maturity (in years)                     30 years                
OKC Portfolio                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                       5.60%              
Interest payment period                                 monthly    
Maturity date                       Apr. 01, 2016              
Loans payable on real estate                       $ 45,763,000              
Fair value of debt assumed                       $ 48,312,000              
Market interest rate                       2.80%              
Amortization of debt premium                       $ 2,549,000              
Reserve at Eagle Ridge                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                         4.70%            
Mortgage indebtedness, carrying amount                         $ 18,850,000            
Interest payment period                                 monthly    
Maturity date                         Mar. 01, 2024            
Weighted Average                                      
Mortgage Loans On Real Estate [Line Items]                                      
Mortgage indebtedness maturity (in years)                                 4 years 10 months 24 days 7 years 1 month 6 days  
Weighted Average | Secured Credit Facility                                      
Mortgage Loans On Real Estate [Line Items]                                      
Mortgage indebtedness maturity (in years)                                 2 years 8 months 12 days [1] 1 year 9 months 18 days [2]  
Minimum | Secured Credit Facility | 1-month LIBOR | Key Bank Senior Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 1.65%                                    
Minimum | Secured Credit Facility | Base Rate | Key Bank Senior Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 0.65%                                    
Maximum | Secured Credit Facility | 1-month LIBOR | Key Bank Senior Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 2.45%                                    
Maximum | Secured Credit Facility | Base Rate | Key Bank Senior Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Debt instrument interest rate 1.45%                                    
Maximum | Senior Interim Term Loan | Key Bank Interim Facility | Limited Partner                                      
Mortgage Loans On Real Estate [Line Items]                                      
Principal amount outstanding $ 100,000,000                                    
Sponsor                                      
Mortgage Loans On Real Estate [Line Items]                                      
Cash paid for interest                                 $ 965,000 $ 966,000  
Mortgages-Floating Rate                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                                 2.80% 2.40%  
Mortgage indebtedness, outstanding principal                                 $ 38,075,000 $ 38,075,000  
Mortgages-Floating Rate | Weighted Average                                      
Mortgage Loans On Real Estate [Line Items]                                      
Effective interest rate                                 2.80% 2.40%  
Mortgage indebtedness maturity (in years)                                 5 years 4 months 24 days 6 years 3 months 18 days  
[1] The total capacity of the secured credit facility is $325.0 million, of which $271.5 million was outstanding as of December 31, 2015.
[2] The secured credit facility total capacity was $30.0 million, of which $18.4 million was outstanding as of December 31, 2014