Earnings Per Share - Additional Information (Detail) - $ / shares shares in Millions |
3 Months Ended | |
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Mar. 31, 2018 |
Mar. 31, 2017 |
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Equity grants with anti-dilutive effect | 1.3 | 5.3 |
| Convertible Senior Notes Due 2019 [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Convertible notes initial conversion price | $ 86.28 | $ 86.28 |
| Convertible Senior Notes Due 2024 [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Convertible notes initial conversion price | $ 124.96 | $ 124.96 |
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The price per share of the conversion feature embedded in the debt instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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