Real Estate and Lease Intangibles - Summary of Aggregate Amortization Expense for Above and Below Market Ground And Retail Lease Intangibles (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Real Estate [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Year 2017	$ (4,392)
Finite-Lived Intangible Assets, Amortization Expense, Year 2018	(4,392)
Finite-Lived Intangible Assets, Amortization Expense, Year 2019	(4,392)
Finite-Lived Intangible Assets, Amortization Expense, Year 2020	(4,392)
Finite-Lived Intangible Assets, Amortization Expense, Year 2021	(4,436)
Ground Lease [Member]
Real Estate [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Year 2017	(4,463)
Finite-Lived Intangible Assets, Amortization Expense, Year 2018	(4,463)
Finite-Lived Intangible Assets, Amortization Expense, Year 2019	(4,463)
Finite-Lived Intangible Assets, Amortization Expense, Year 2020	(4,463)
Finite-Lived Intangible Assets, Amortization Expense, Year 2021	(4,463)
Retail Site [Member]
Real Estate [Line Items]
Finite-lived Intangible Assets; Amortization Exp, Year 2017	71
Finite-lived Intangible Assets; Amortization Exp, Year 2018	71
Finite-lived Intangible Assets; Amortization Exp, Year 2019	71
Finite-lived Intangible Assets; Amortization Exp, Year 2020	71
Finite-lived Intangible Assets; Amortization Exp, Year 2021	$ 27