Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of the statutory federal income tax rate to the effective tax rate
Statutory federal income tax rate	21.00%	21.00%	21.00%
Effect of:
State and local income taxes	2.20%	2.50%	2.30%
Investment vehicles	(0.80%)	(0.80%)	(1.30%)
Employee share-based payments	(4.80%)	(3.80%)	(3.30%)
Research and development credits	(0.60%)	(0.50%)	(1.10%)
Amended returns and refunds	0.20%	0.30%	0.10%
Tax credit reversal	0.00%	0.00%	3.70%
Other - net	(0.10%)	0.70%	0.80%
Reported effective tax rate	17.10%	19.40%	22.20%

Effective Income Tax Rate Reconciliation, Amended Returns And Refunds, Percent

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Effective Income Tax Rate Reconciliation, Pre-Adjusted Rate, Percent [Abstract]

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
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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 other adjustments.

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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