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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness, outstanding principal | $ 993,296 |  | $ 417,369 |
Mortgage indebtedness, carrying amount | $ 993,908 |  | $ 418,901 |
Mortgage indebtedness, weighted average interest rate | 3.60% |  | 3.60% |
Bridge Term Loan |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness, outstanding principal | $ 120,000 |  |  |
Mortgage indebtedness, carrying amount | $ 120,000 |  |  |
Type | Floating |  |  |
Mortgage indebtedness, weighted average interest rate | 5.20% |  |  |
Mortgages-Fixed Rate |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness, outstanding principal | $ 563,721 |  | $ 360,902 |
Mortgage indebtedness, carrying amount | $ 564,333 |  | $ 362,434 |
Type | Fixed |  | Fixed |
Mortgage indebtedness, weighted average interest rate | 3.80% |  | 3.80% |
Mortgages-Floating Rate |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness, outstanding principal | $ 38,075 |  | $ 38,075 |
Mortgage indebtedness, carrying amount | $ 38,075 |  | $ 38,075 |
Type | Floating |  | Floating |
Mortgage indebtedness, weighted average interest rate | 2.40% |  | 2.40% |
Secured Credit Facility |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness, outstanding principal | $ 271,500 | [1] | $ 18,392 | [2]
Mortgage indebtedness, carrying amount | $ 271,500 | [1] | $ 18,392 | [2]
Type | Floating | [1] | Floating | [2]
Mortgage indebtedness, weighted average interest rate | 2.60% | [1] | 2.70% | [2]
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 | Bridge Term Loan |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness maturity (in years) | 1 year |  |  |
Weighted Average | Mortgages-Fixed Rate |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Mortgage indebtedness maturity (in years) | 7 years |  | 7 years 6 months |
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 | 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]
[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.

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