Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		9 Months Ended
	Jan. 23, 2013 Oxford [Member]	Sep. 30, 2014 Coventry II Joint Ventures [Member] Property
Contingencies And Commitments [Line Items]
Number of existing retail properties		10
Amount transferred to pay vendors pursuant to an agreement	$ 11