Commitments and Contingencies - Additional Information (Detail) $ in Thousands |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2017
USD ($)
Property
|
Dec. 31, 2016
USD ($)
Agreement
|
|
| Commitments And Contingencies Disclosure [Abstract] | ||
| Number of lease agreements assumed in acquisitions | Agreement | 3 | |
| Tenant improvement allowances in acquisitions | $ 10,464 | |
| Payments for work completed under tenant improvement allowances | $ 3,863 | 974 |
| Tenant improvement allowances | $ 5,627 | $ 9,490 |
| Number of properties damaged by fire | Property | 3 |