Intangible Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases, Acquired-in-Place, Market Adjustment [Member]
Finite Lived Intangible Assets [Line Items]
Rental income increase	$ 19,523	$ 9,536	$ 9,917
Leases, Acquired-in-Place [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of acquired in-place leases	$ 76,016	$ 94,935	$ 128,603