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Commitments and Contingencies - Summary of Ground Lease Payment Obligations (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018 (remaining) $ 350
2019 1,410
2020 1,445
2021 1,481
2022 1,518
Thereafter 460,905
Total $ 467,109