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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax expense at statutory rate (percent)	21.00%	35.00%	35.00%
Increase (decrease) in tax rate resulting from:
State and other income taxes, net of federal tax benefit (percent)	4.50%	3.50%	3.80%
(Decrease) increase in valuation allowance (percent)	(0.40%)	0.40%	0.10%
Nondeductible government, class action, and related settlements (percent)	2.70%	0.00%	0.00%
Noncontrolling interests (percent)	(3.20%)	(4.60%)	(4.40%)
Share-based windfall tax benefits (percent)	(0.40%)	(1.80%)	0.00%
Tax Act (percent)	0.00%	(2.80%)	0.00%
Other, net (percent)	(0.10%)	(0.30%)	(0.50%)
Income tax expense (percent)	24.10%	29.40%	34.00%

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Effective Income Tax Rate Reconciliation, Share-based windfall tax benefits, percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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