Commitments, Contingencies and Guarantees (Details Textual) - USD ($)			1 Months Ended		3 Months Ended			6 Months Ended
	Dec. 31, 2015	Aug. 07, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Commitments [Line Items]
Redeemable Noncontrolling Interest, Equity, Fair Value	$ 69,471,000		$ 69,471,000		$ 65,367,000			$ 65,367,000
Initial Perquisites Repayment	$ 11,285
Bonus Repayment		$ 10,582	$ 1,500	$ 1,000
Non-recoverable cash bonus award charge						$ 5,338
Investment Commitments					2,711,000			2,711,000
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					15,403,000			$ 15,403,000
Contractual redemption right [Domain] | Common Class A [Member]
Other Commitments [Line Items]
Redeemable Noncontrolling Interest, Equity, Redemption Value					121,000			121,000
Excess initial redemption value [Domain]
Other Commitments [Line Items]
Redeemable Noncontrolling Interest, Equity, Redemption Value					2,839,000			2,839,000
Termination or death redemption right [Domain]
Other Commitments [Line Items]
Redeemable Noncontrolling Interest, Equity, Redemption Value					47,125,000			47,125,000
SEC Investigation [Member]
Other Commitments [Line Items]
Professional Fees					$ 252		$ 3,882	$ 1,738	$ 9,644