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Common Equity and Earnings per Share - Schedule of Weighted Average of Potential Class A Common Stock Excluded from Computation of Earnings Per Share (Detail) - Class A - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 3,262 | 1,073
2025 Notes |  |
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 1,633 | 0
2027 Notes |  |
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 334 | 0
Stock Options |  |
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 1,211 | 1,073
RSU |  |
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 81 | 0
Employee Stock Purchase Plan |  |
Class of Stock |  |
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share | 3 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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