Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax at statutory rate	$ 34,419	$ 29,544	$ 22,899
State taxes, net of federal benefit	9,775	6,859	6,450
Nondeductible compensation	2,686	2,080	2,182
Effect of net (income) loss attributable to noncontrolling interests	(1,939)	(968)	(171)
Change in valuation allowance	(1,383)	(1,330)	4,508
Other, net	377	(1,008)	(2,907)
Income tax expense (benefit)	$ 43,935	$ 35,177	$ 32,961
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax at statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	6.00%	5.00%	6.00%
Nondeductible compensation	2.00%	2.00%	2.00%
Effect of net (income) loss attributable to noncontrolling interests	(1.00%)	(1.00%)	0.00%
Change in valuation allowance	(1.00%)	(1.00%)	4.00%
Other, net	0.00%	(1.00%)	(3.00%)
Income tax expense (benefit)	27.00%	25.00%	30.00%

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

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-Name Accounting Standards Codification
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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 noncontrolling interest income (loss) exempt from income taxes.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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