Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Compensation and Benefits - Non-cash Compensation Awards (Details) - $ / shares		9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2017
Equity Incentive Plan 2006 \| Restricted Class B Units
Compensation Arrangements [Line Items]
Grants in period (in shares)		9,372	40,500
Grants in period, weighted average grant date fair value (USD per share)		$ 10.67	$ 11.11
Equity Incentive Plan 2006 \| Options To Purchase Delayed Exchange Class B Units
Compensation Arrangements [Line Items]
Grants in period (in shares)	1,062,820	1,380,128	2,630,000
Grants in period, weighted average grant date fair value (USD per share)	$ 1.95
Grants in period, weighted average grant date fair value (USD per share)		$ 1.95	$ 2.30
Equity Incentive Plan 2006 \| Options to Purchase Class B Units
Compensation Arrangements [Line Items]
Grants in period (in shares)		0	320,000
Grants in period, weighted average grant date fair value (USD per share)		$ 0	$ 3.04
Equity Incentive Plan 2006 \| Delayed Exchange Unit
Compensation Arrangements [Line Items]
Grants in period (in shares)	300,931
Grants in period, weighted average grant date fair value (USD per share)	$ 7.04
Equity Incentive Plan 2006 \| Phantom Class B Units
Compensation Arrangements [Line Items]
Vesting period for units (in years)		10 years
2007 Equity Incentive Plan \| Options to Purchase Shares of Class A Common Stock
Compensation Arrangements [Line Items]
Grants in period (in shares)		0	50,000
Grants in period, weighted average grant date fair value (USD per share)		$ 0	$ 3.04
Vesting period for units (in years)		5 years