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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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)	3.80%	3.60%	4.30%
Increase (decrease) in valuation allowance (percent)	0.10%	1.20%	(1.90%)
Noncontrolling interests (percent)	(4.40%)	(5.30%)	(5.10%)
Acquisition of additional equity interest in Fairlawn (percent)	0.00%	0.00%	(3.60%)
Other, net (percent)	(0.50%)	1.40%	(0.10%)
Income tax expense (percent)	34.00%	35.90%	28.60%

X

- Definition

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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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