Income Taxes - Reconciliation of Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax provision at the U.S. federal statutory rate	21.00%	21.00%	21.00%
Less: rate attributable to noncontrolling interest	(7.50%)	(8.10%)	(10.20%)
State and local taxes, net of federal benefit	3.40%	2.40%	1.90%
Non-deductible expenses, net	0.10%	(3.70%)	(0.30%)
Other, net	1.90%	(1.00%)	(1.50%)
Effective tax rate	18.90%	10.60%	10.90%