Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Below market rents, acquired	$ 7.9	$ 10.9
Below market rents acquired, weighted average useful life	20 years 6 months	12 years 1 month 6 days
Above-market ground lease, acquired		$ 0.7
Above-market ground lease acquired, weighted average useful life		11 years 6 months
In-place lease intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 24.2	$ 41.6
Acquired intangible assets, weighted average useful life	4 years 3 months 18 days	4 years 1 month 6 days
Above-market rent
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 2.5	$ 2.7
Acquired intangible assets, weighted average useful life	1 year 8 months 12 days	4 years 9 months 18 days