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Related Party Transactions - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Related Party Transaction [Line Items]          
Base management fees $ 2,600 $ 1,292 $ 4,759 $ 2,581  
Base management fees incurred but not yet paid 2,600   2,600   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    
Base management fees 2,600 1,292 4,579 2,581  
Total expenses related to reimbursements 108 281 334 514  
Base management fees incurred but not yet paid $ 2,600   $ 2,600   $ 2,037