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Capital Stock (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |  |
Beginning balance | 247,144,356 | 169,316,460 | 168,628,177
Stock options/SARs exercised | 0 | 0 | 77,002
Restricted stock grants | 539,096 | 490,609 | 335,103
Shares retired | 0 | (739) | 0
Treasury shares | 15,580 | 28,736 | 23,671
Ending balance | 248,129,430 | 247,144,356 | 169,316,460
MRD |  |  |
Class Of Stock [Line Items] |  |  |
MRD Merger | 0 | 77,042,749 | 0
Restricted Stock |  |  |
Class Of Stock [Line Items] |  |  |
Restricted stock units vested | 344,937 | 266,541 | 252,507
Performance Share |  |  |
Class Of Stock [Line Items] |  |  |
Performance stock units issued | 85,461 | 0 | 0

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