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Investment in Real Estate - Summary of Intangible Assets (Liabilities) Subject to Amortization in Period of Acquisition (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
In-Place Leases [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite lived intangible asset, fair value $ 1,750 $ 2,511
Acquired finite lived intangible asset, weighted average life 118 months 56 months
Tenant Relationships [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite lived intangible asset, fair value 1,012 1,553
Acquired finite lived intangible asset, weighted average life 178 months 116 months
Above Market Leases [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite lived intangible asset, fair value   2,883
Acquired finite lived intangible asset, weighted average life   56 months
Below Market Leases [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite lived intangible asset, fair value $ (102)  
Acquired finite lived intangible asset, weighted average life 118 months