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Investment in Unconsolidated Joint Venture - Additional Information (Details) € in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2017 USD ($) | May 31, 2017 EUR (€) | Jun. 30, 2016 EUR (€) | Feb. 28, 2015 USD ($) | Feb. 28, 2015 EUR (€) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 EUR (€) | Jan. 31, 2015 USD ($) | Jan. 31, 2015 EUR (€) | Sep. 30, 2014 EUR (€)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial funding for equity method investment |  |  |  |  |  |  |  | $ 726 | $ 362 | $ 3,929 |  |  |  |
KBCD Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial funding for equity method investment |  |  |  |  |  | $ 39,477 | € 30,724 |  |  |  |  |  |  |
Wholly-owned subsidiary [Member] | Champ Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  |  |  |  | 59.00% |  | 0.00% |  |  | 0.00% |  |  | 59.00%
Champ LP [Member] | KBC Bank Deutschland AG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (percentage) |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  | 35.00%
Company and affiliated investors ownership, percentage |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |
Commitment to Invest in KBCD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to invest |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  | € 38,000
Unfunded Commitment, Champ L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to invest |  |  | € 2,802 |  |  |  |  | $ 2,985 |  |  | € 2,802 |  |  |
Other commitment, commitment transfer | € |  |  | € 427 |  |  |  |  |  |  |  |  |  |  |
Champ LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  | 48.00% | 48.00% |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 24,498 | € 21,792 |  | $ 20,794 | € 16,314 |  |  |  |  |  |  |  |  |
Foreign exchange adjustments included in other comprehensive loss |  |  |  | $ 2,614 |  |  |  |  |  |  |  |  |  |
Loss on disposal of equity method investment | $ 3,305 |  |  |  |  |  |  |  |  |  |  |  |  |
Champ LP [Member] | Additional Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to invest |  |  |  |  |  |  |  |  |  |  |  | $ 3,929 | € 3,331 |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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