Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Detail)

v3.5.0.2
Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Detail) - Ground Leases [Member]
$ in Thousands
3 Months Ended
Sep. 30, 2016
USD ($)
Operating Leased Assets [Line Items]  
For the year ended December 31, 2016 $ 114
For the year ended December 31, 2017 462
For the year ended December 31, 2018 464
For the year ended December 31, 2019 465
For the year ended December 31, 2020 466
Thereafter $ 4,948
Tulsa, OK [Member]  
Operating Leased Assets [Line Items]  
Lease End Date 2021-04
For the year ended December 31, 2016 $ 42
For the year ended December 31, 2017 169
For the year ended December 31, 2018 169
For the year ended December 31, 2019 169
For the year ended December 31, 2020 169
Thereafter $ 85
Springfield, MA [Member]  
Operating Leased Assets [Line Items]  
Lease End Date 2030-02
For the year ended December 31, 2016 $ 21
For the year ended December 31, 2017 89
For the year ended December 31, 2018 90
For the year ended December 31, 2019 90
For the year ended December 31, 2020 90
Thereafter $ 884
Dartmouth, MA [Member]  
Operating Leased Assets [Line Items]  
Lease End Date 2036-05
For the year ended December 31, 2016 $ 44
For the year ended December 31, 2017 174
For the year ended December 31, 2018 174
For the year ended December 31, 2019 174
For the year ended December 31, 2020 174
Thereafter $ 3,126
Salt Lake City UT [Member]  
Operating Leased Assets [Line Items]  
Lease End Date 2040-11
For the year ended December 31, 2016 $ 7
For the year ended December 31, 2017 30
For the year ended December 31, 2018 31
For the year ended December 31, 2019 32
For the year ended December 31, 2020 33
Thereafter $ 853