Lease Intangibles - Summary of the Carrying Amounts for Acquired Real Estate Leases and Assumed Real Estate Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	$ 146,854	$ 225,266
Acquired real estate leases, net	48,281	88,760
Leases, Acquired-in-Place
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	102,102	147,056
Accumulated amortization	(71,320)	(91,301)
Leases Acquired-in-Place, Above Market Lease
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	44,752	78,210
Accumulated amortization	(27,253)	(45,205)
Leases Acquired-in-Place, Below Market Lease
Finite-Lived Intangible Assets [Line Items]
Acquired real estate leases	10,434	19,742
Accumulated amortization	(8,488)	(15,446)
Assumed real estate lease obligations, net	$ 1,946	$ 4,296