Income Taxes - Reconciliation of Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax provision at the U.S. federal statutory rate	21.00%	21.00%	35.00%
Less: rate attributable to noncontrolling interest	(8.10%)	(10.20%)	(19.10%)
State and local taxes, net of federal benefit	2.40%	1.90%	(1.90%)
Impact of 2017 Tax Act on deferred tax assets	0.00%	0.00%	80.10%
Impact of 2017 Tax Act on tax receivable agreement obligation	0.00%	0.00%	(12.90%)
Non-deductible expenses, net	(3.70%)	(0.30%)	1.90%
Other, net	(1.00%)	(1.50%)	0.20%
Effective tax rate	10.60%	10.90%	83.30%