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Related Party Transactions and Arrangements - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May. 07, 2013 Property | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Advisor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Quarterly management fee as percentage of average real estate assets | 0.1875% |  |  |  |  |
Number of properties excluded from computation of base management fee | Property | 8 |  |  |  |  |
Quarterly management fee payment rate as percentage of average real estate assets | 0.1875% |  |  |  |  |
Asset management fees earned |  | $ 1,259 | $ 445 | $ 3,306 | $ 938 |
Advisor incentive fee |  | 20.00% |  | 20.00% |  |
Incentive fees expense for advisor |  | $ 0 | 0 | $ 425 | 154 |
Management fee of our cumulative equity raised |  |  |  | 0.375% |  |
Internal return per share | $ / shares |  |  |  | $ 0.20 |  |
Advisor | Incentive Fees |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Incentive fees payable to advisor |  | 0 |  | $ 0 |  | $ 644
Advisor | If IROP elects to extend its maturity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Advisor incentive fee | 0.00% |  |  |  |  |
Advisor | If IROP elects to extend its maturity | Maximum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cumulative gross amount of equity capital, hurdle rate | 1.75% |  |  |  |  |
Cumulative gross amount of equity capital, annual hurdle rate | 7.00% |  |  |  |  |
Advisor | if pre-incentive fee Core FFO exceeds hurdle rate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Advisor incentive fee | 20.00% |  |  |  |  |
Advisor | if pre-incentive fee Core FFO exceeds hurdle rate | Minimum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cumulative gross amount of equity capital, hurdle rate | 1.75% |  |  |  |  |
Cumulative gross amount of equity capital, annual hurdle rate | 7.00% |  |  |  |  |
Property Manager |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of gross revenues from the property |  |  |  | 4.00% |  |
Property management and leasing fees |  | 861 | $ 471 | $ 2,381 | $ 1,203 |
Property Manager | Accounts Payable and Accrued Expenses |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Property management and leasing fees payable |  | $ 336 |  | $ 336 |  | $ 205

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