Intangible Assets and Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Intangible Assets Goodwill And Other Assets [Line Items]
Net recognition in rental income	$ 0		$ 0
Leases, Acquired-in-Place
Intangible Assets Goodwill And Other Assets [Line Items]
Amortization expense	0.02	0.02	0.06	0.06
Above Market Leases
Intangible Assets Goodwill And Other Assets [Line Items]
Amortization expense	0.09	0.10	0.30	0.40
Amount of partnership wrote-off	0.3		0.9
Market Leases Below
Intangible Assets Goodwill And Other Assets [Line Items]
Accretion	0.2	0.5	0.8	1.5
Amount of partnership wrote-off	$ 0.3		$ 4.7