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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% |

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