Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 Property	Jun. 30, 2013 Oxford [Member]	Jan. 23, 2013 Oxford [Member]
Contingencies And Commitments [Line Items]
Number of existing retail properties	10
Minimum amount of compensatory and consequential damages	Not less than $500 million
Amount transferred to pay vendors pursuant to an agreement			$ 11
Unasserted claim under agreement		$ 5