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Commitments, Contingencies and Guarantees (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Aug. 07, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value | $ 69,471,000 |  | $ 69,471,000 |  | $ 60,174,000 |  | $ 60,174,000 |
Initial Perquisites Repayment | $ 11,285 |  |  |  |  |  |  |
Bonus Repayment |  | $ 10,582 | $ 1,500 | $ 1,000 |  |  |  |
Non-recoverable cash bonus award charge |  |  |  |  |  | $ 5,338 |  |
Investment Commitments |  |  |  |  | 891,000 |  | 891,000 |
Letters of Credit Outstanding, Amount |  |  |  |  | 4,597,000 |  | $ 4,597,000 |
Minimum [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interest obligation, year of payment |  |  |  |  |  |  | 2016 |
Maximum [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interest obligation, year of payment |  |  |  |  |  |  | 2024 |
Contractual redemption right [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  |  |  |  | 13,324,000 |  | $ 13,324,000 |
Contractual redemption right [Domain] | Common Class A [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  |  |  |  | 126,000 |  | 126,000 |
Excess initial redemption value [Domain] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  |  |  |  | 3,060,000 |  | 3,060,000 |
Termination or death redemption right [Domain] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  |  |  |  | 43,790,000 |  | 43,790,000 |
SEC Investigation [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Professional Fees |  |  |  |  | $ 2,463 | $ 2,722 | $ 725 | $ 12,366

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