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Shareholders' equity - Additional Information (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shareholders Equity [Line Items] |  |  |
Common shares, authorized | 200,000,000 |  |
Common shares, par value (in dollars per share) | $ 1 | $ 1 |
Preference shares, authorized | 500,000 |  |
Per share market price of common stock (in dollars per share) | $ 61.32 |  |
Strike price of warrants (in dollars per share) | $ 74.65 |  |
Conversion of convertible notes, shares issued upon conversion | 500,000 | 1,700,000 | 2,700,000
Convertible senior notes percentage | 3.875% | 3.875% | 3.875%
Stock Option |  |  |
Shareholders Equity [Line Items] |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share (in shares) | 600,000 | 3,400,000 | 5,600,000
Convertible Note |  |  |
Shareholders Equity [Line Items] |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share (in shares) | 300,000 | 2,000,000 | 3,300,000

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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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