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Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class A Common Stock and Class C Capital Stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total Class A common stock and Class C capital stock equivalents (in shares) | 39,870 | 41,920 | 40,830 | 38,719
Class A Common Stock and Class C Capital Stock | Weighted-average | Option awards |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total Class A common stock and Class C capital stock equivalents (in shares) | 245 | 25,202 | 1,389 | 22,649
Class A Common Stock and Class C Capital Stock | Weighted-average | Restricted stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total Class A common stock and Class C capital stock equivalents (in shares) | 984 | 9,086 | 645 | 8,354
Class A Common Stock | Convertible notes maturing in 2020 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total Class A common stock and Class C capital stock equivalents (in shares) | 0 | 400 | 0 | 400
Class C Capital Stock | Convertible notes maturing in 2023, 2024, 2025 and 2026 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total Class A common stock and Class C capital stock equivalents (in shares) | 38,641 | 7,232 | 38,796 | 7,316

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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=124432515&loc=d3e3550-109257 + Details
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