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Capital Stock (Detail) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |
Beginning balance | 248,129,430 | 247,144,356
Restricted stock grants | 673,791 | 539,096
Treasury shares issued | 895 | 15,580
Ending balance | 249,222,320 | 248,129,430
Restricted Stock |  |
Class Of Stock [Line Items] |  |
Restricted stock units vested | 397,774 | 344,937
Performance Share |  |
Class Of Stock [Line Items] |  |
Performance stock units issued | 20,430 | 85,461

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