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Income Taxes - Schedule of Appropriate Statutory Rate to Income Before Income Taxes (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of federal statutory tax rates      
U.S. statutory tax rate 21.00% 35.00% 35.00%
Increase (decrease) due to state and local taxes 4.00% 2.70% 2.30%
Rate benefit as a U.S. limited partnership/flow through (6.10%) (10.10%) (21.80%)
Estimated re-measurement impact primarily related to the Tax Act 0.00% 51.70% 0.00%
Other income from reduction of amount due pursuant to tax receivable agreement in connection with the Tax Act 0.00% (14.60%) 0.00%
Excess tax benefit from equity compensation delivery (5.70%) (1.70%) 0.00%
Foreign taxes 0.40% 0.70% (0.90%)
Other (0.80%) 0.20% 0.30%
Effective income tax rate 12.80% 63.90% 14.90%