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Common Shares - Additional Information (Detail) - USD ($) | Jul. 02, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 12, 2017 | May 10, 2005
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Class of Stock [Line Items] |  |  |  |  |
Common stock, shares issued |  | 508,763,020 | 508,763,020 |  | 6,000
Common shares, par value |  | $ 2.00 | $ 2.00 |  | $ 2.00
Treasury shares held by Company |  | 4,244,080 | 4,244,080 |  |
Outstanding shares in issue |  | 504,518,940 | 504,518,940 | 504,518,940 |
Dividends payable |  |  |  | $ 0 |
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common share issued | 100,000,000 |  |  |  |

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