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Other Assets - Additional Information (Detail) (Leases, Acquired-in-Place [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Leases, Acquired-in-Place [Member]
   
Other Assets [Line Items]    
Gross in-place lease intangibles $ 48.3 $ 33.3
Accumulated amortization $ 36.2 $ 19.1