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