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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax expense at statutory rate (percent)	35.00%	35.00%	35.00%
Increase (decrease) in tax rate resulting from:
State and other income taxes, net of federal tax benefit (percent)	3.50%	3.80%	3.60%
Increase (decrease) in valuation allowance (percent)	0.40%	0.10%	1.20%
Noncontrolling interests (percent)	(4.60%)	(4.40%)	(5.30%)
Share-based windfall tax benefits (percent)	(1.80%)	0.00%	0.00%
Other, net (percent)	(0.10%)	(0.50%)	1.40%
Income tax expense (percent)	32.40%	34.00%	35.90%

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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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