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Capital Stock (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |  |
Beginning balance | 248,129,430 | 247,144,356 | 169,316,460
Restricted stock grants | 865,095 | 539,096 | 490,609
Shares retired |  |  | (739)
Treasury shares | 5,302 | 15,580 | 28,736
Ending balance | 249,510,022 | 248,129,430 | 247,144,356
MRD |  |  |
Class Of Stock [Line Items] |  |  |
MRD Merger |  |  | 77,042,749
Restricted Stock |  |  |
Class Of Stock [Line Items] |  |  |
Restricted stock units vested | 434,046 | 344,937 | 266,541
Performance Share |  |  |
Class Of Stock [Line Items] |  |  |
Performance stock units issued | 76,149 | 85,461 |

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