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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Property
Sep. 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