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Commitments, Contingencies and Guarantees (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Other Commitments [Line Items] |  |  |
Redeemable noncontrolling interests |  | $ 55,730 | $ 62,886
Investment commitments |  | 80 |
Amount of letters of credit outstanding |  | 5,248 |
Minimum |  |  |
Other Commitments [Line Items] |  |  |
Redeemable noncontrolling interest obligation, year of payment | 2018 |  |
Maximum |  |  |
Other Commitments [Line Items] |  |  |
Redeemable noncontrolling interest obligation, year of payment | 2023 |  |
Contractual redemption right |  |  |
Other Commitments [Line Items] |  |  |
Redemption value |  | 13,330 |
Contractual redemption right | Common Class A |  |  |
Other Commitments [Line Items] |  |  |
Redemption value |  | 154 |
Termination or death redemption right |  |  |
Other Commitments [Line Items] |  |  |
Redemption value |  | 37,003 |
Excess initial redemption value |  |  |
Other Commitments [Line Items] |  |  |
Redemption value |  | $ 5,397 |

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- Definition Amount of fund to be committed towards investments. + References No definition available. + Details
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- Definition The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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