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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Related Party Transaction [Line Items]      
Base management fees $ 2,160 $ 1,289  
Base management fees incurred but not yet paid 2,160   2,037
Management [Member]
      
Related Party Transaction [Line Items]      
Rate of management fees 1.50%    
Period of termination 180 days    
Period to be considered, for average annual base management fee 24 months    
Current term of the Management Agreement expiration date September 29, 2013    
Base management fees 2,160 1,289  
Total expenses related to reimbursements 226 233  
Base management fees incurred but not yet paid $ 2,160   $ 2,037