Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.70%	6.60%	4.00%
Valuation allowance	(5.90%)	(8.90%)	(2.00%)
Foreign income taxes	(0.10%)	0.10%	(0.10%)
Goodwill	(9.30%)	(0.40%)	(1.70%)
Stock based compensation	(0.80%)	(0.20%)	(0.20%)
Officers’ life insurance/insurance proceeds	0.00%	0.00%	0.20%
Acquisition and integration costs	(0.40%)	0.10%	(0.20%)
Reserves for uncertain tax positions	0.30%	0.00%	3.90%
Sale of stock of subsidiary	(0.50%)	0.00%	0.00%
Capital loss tax benefit	0.00%	4.20%	0.00%
Disallowed losses on sale to related party	(3.90%)	(0.30%)	0.00%
Deferred tax adjustment upon contribution of CIE to CGP	0.00%	(0.50%)	0.00%
Noncontrolling interests	1.00%	0.00%	0.00%
Other	(0.20%)	0.00%	0.00%
Effective tax rate	16.90%	35.70%	38.90%

Effective Income Tax Rate Reconciliation, Acquisition and Integration Costs

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Effective Income Tax Rate Reconciliation, Goodwill

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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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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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 noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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