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Mortgage Indebtedness - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 17, 2015
Apr. 13, 2015
Jan. 27, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Mortgage Loans On Real Estate [Line Items]                  
Secured credit facility borrowing capacity $ 325,000,000       $ 325,000,000 $ 30,000,000 $ 325,000,000 $ 30,000,000  
Credit facility withdrawals             $ 271,500,000   $ 18,400,000
Mortgage indebtedness, weighted average interest rate             3.60%   3.60%
Mortgage indebtedness, outstanding principal 993,296,000       993,296,000   $ 993,296,000   $ 417,369,000
Cash paid for interest             13,354,000 6,022,000  
Mortgage indebtedness, carrying amount 602,408,000       602,408,000   $ 602,408,000   $ 400,509,000
Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate             2.60% [1]   2.70% [2]
Mortgage indebtedness, outstanding principal 271,500,000 [1]       271,500,000 [1]   $ 271,500,000 [1]   $ 18,392,000 [2]
The Huntington National Bank                  
Mortgage Loans On Real Estate [Line Items]                  
Credit facility withdrawals         14,848,000   14,848,000    
Repayment of secured credit facility         14,848,000   33,240,000    
Key Bank Senior Facility | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Secured credit facility borrowing capacity   $ 325,000,000              
Secured credit facility, remaining borrowing capacity 53,500,000       53,500,000   53,500,000    
Key Bank Senior Facility | Revolving Line of Credit                  
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%              
Key Bank Senior Facility | Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Secured credit facility borrowing capacity   $ 200,000,000              
Secured credit facility, remaining borrowing capacity $ 0       0   0    
Key Bank Senior Facility | 1-month LIBOR | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate 2.45%                
Key Bank Senior Facility | Limited Partner | Secured Credit Facility                  
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              
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%              
Key Bank Interim Facility | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Secured credit facility borrowing capacity   $ 120,000,000              
Mortgage indebtedness maturity (in years)   364 days              
Secured credit facility, remaining borrowing capacity $ 0       0   0    
Key Bank Interim Facility | 1-month LIBOR | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate 5.00%                
Key Bank Interim Facility | Limited Partner | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Percentage of net proceeds from equity issuances, sales of assets, refinancing of assets   100.00%              
Key Bank Interim Facility | Limited Partner | 1-month LIBOR | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   5.00%              
Key Bank Interim Facility | Limited Partner | Base Rate | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   4.00%              
Key Bank Interim Facility | Limited Partner | If IROP elects to extend its maturity | 1-month LIBOR | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   6.50%              
Key Bank Interim Facility | Limited Partner | If IROP elects to extend its maturity | Base Rate | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   5.50%              
Sponsor                  
Mortgage Loans On Real Estate [Line Items]                  
Cash paid for interest         243,000 $ 241,000 $ 722,000 $ 723,000  
Mortgages-Floating Rate                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate             2.40%   2.40%
Mortgage indebtedness, outstanding principal $ 38,075,000       38,075,000   $ 38,075,000   $ 38,075,000
Mortgages-Fixed Rate                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate             3.80%   3.80%
Mortgage indebtedness, outstanding principal $ 563,721,000       $ 563,721,000   $ 563,721,000   $ 360,902,000
Iron Rock Ranch                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate       3.40%          
Mortgage indebtedness, carrying amount       $ 22,900,000          
Interest payment period             Monthly    
Mortgage indebtedness, maturity date       Feb. 01, 2025          
Stonebridge At The Ranch                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate     3.20%            
Mortgage indebtedness, carrying amount     $ 20,527,000            
Interest payment period             Monthly    
Mortgage indebtedness, maturity date     May 01, 2025            
Creekstone At R T P                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate   3.90%              
Mortgage indebtedness, carrying amount   $ 23,250,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   4.30%              
Mortgage indebtedness, carrying amount   $ 23,750,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   3.80%              
Mortgage indebtedness, carrying amount   $ 25,000,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   4.30%              
Mortgage indebtedness, carrying amount   $ 4,175,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   4.10%              
Mortgage indebtedness, carrying amount   $ 33,635,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   3.20%              
Mortgage indebtedness, carrying amount   $ 30,600,000              
Interest payment period             Monthly    
Mortgage indebtedness, 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]                  
Mortgage indebtedness, weighted average interest rate   3.70%              
Mortgage indebtedness, carrying amount   $ 16,250,000              
Interest payment period             Monthly    
Mortgage indebtedness, maturity date   Apr. 05, 2022              
Waterstone at Brier Creek | Supplemental Loan Agreement                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate   4.20%              
Mortgage indebtedness, carrying amount   $ 4,175,000              
Interest payment period             Monthly    
Mortgage indebtedness, maturity date   Apr. 05, 2022              
Weighted Average                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness, weighted average interest rate             3.70%    
Mortgage indebtedness maturity (in years)             5 years 1 month 6 days   7 years 1 month 6 days
Weighted Average | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness maturity (in years)             3 years [1]   1 year 9 months 18 days [2]
Weighted Average | Mortgages-Floating Rate                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness maturity (in years)             5 years 7 months 6 days   6 years 3 months 18 days
Weighted Average | Mortgages-Fixed Rate                  
Mortgage Loans On Real Estate [Line Items]                  
Mortgage indebtedness maturity (in years)             7 years   7 years 6 months
Minimum | Key Bank Senior Facility | Limited Partner | 1-month LIBOR | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   1.65%              
Minimum | Key Bank Senior Facility | Limited Partner | Base Rate | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   0.65%              
Maximum | Key Bank Senior Facility | Limited Partner | 1-month LIBOR | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   2.45%              
Maximum | Key Bank Senior Facility | Limited Partner | Base Rate | Secured Credit Facility                  
Mortgage Loans On Real Estate [Line Items]                  
Debt instrument interest rate   1.45%              
Maximum | Key Bank Interim Facility | Limited Partner | Senior Interim Term Loan                  
Mortgage Loans On Real Estate [Line Items]                  
Principal amount outstanding   $ 100,000,000              
[1] (1) The secured credit facility total capacity is $325.0 million, of which $271.5 million was drawn as of September 30, 2015.
[2] The secured credit facility total capacity was $30.0 million, of which $18.4 million was drawn as of December 31, 2014.