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Related Party Transactions - Additional Information (Details)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2012
USD ($)
Sep. 30, 2013
Management [Member]
USD ($)
Sep. 30, 2012
Management [Member]
USD ($)
Sep. 30, 2013
Management [Member]
USD ($)
Sep. 30, 2012
Management [Member]
USD ($)
Dec. 31, 2012
Management [Member]
USD ($)
Sep. 30, 2013
RSU to Manager [Member]
USD ($)
Sep. 30, 2013
KBCD Partnership [Member]
USD ($)
Sep. 30, 2013
KBCD Partnership [Member]
EUR (€)
Sep. 30, 2013
KBCD [Member]
Dec. 31, 2012
KBCD [Member]
EUR (€)
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 $ 2,625 $ 1,518 $ 7,384 $ 4,099   $ 2,625 $ 1,518 $ 7,384 $ 4,099            
Total expenses related to reimbursements           208 203 542 721            
Base management fees incurred but not yet paid 2,656   2,656   2,037 2,625   2,625   2,037 31        
Maximum limited partnership investment                       50,000 38,000    
Total assets of acquiree                             € 2,607,000
Indirect ownership interest from limited partnership                           21.00%  
Structure fee of limited partnership                       1.62% 1.62%    
Additional ownership interest from limited partnership                           10.00%