Real Estate and Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Ground Lease [Member]
Land held for development:
Amortization of above/below market leases	$ 1.1	$ 1.1	$ 2.2	$ 2.2
Retail Lease [Member]
Land held for development:
Amortization of above/below market leases	$ 0.3	$ 0.3	$ 0.5	$ 0.5

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

No definition available.

Name:	us-gaap_AmortizationOfAboveAndBelowMarketLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration