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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	3,734	1,014	3,500	1,050
2025 Convertible Notes
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	1,633	0	1,633	0
2027 Convertible Notes
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	733	0	535	0
Stock Options
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	1,275	1,014	1,243	1,050
RSU
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	88	0	85	0
Employee Stock Purchase Plan
Class of Stock
Weighted shares of potential class A stock excluded from calculation of diluted earnings per share	5	0	4	0

X

- 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

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- Definition

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+ References

No definition available.

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