Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Significant components of deferred tax assets and liabilities:
Net operating loss	$ 12,275	$ 8,397
Step-up in tax basis in Group LP assets	333,221	356,069
Deferred compensation	65,742	45,875
Lease liability	39,994
Gross	451,232	410,341
Valuation allowance on NOL and other	(10,038)	(7,014)
Deferred tax asset	441,194	403,327
Right-of-use asset	(38,559)
Other	(2,139)	(468)
Deferred tax liability	(40,698)	(468)
Net deferred tax asset	$ 400,496	$ 402,859