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Capital Stock (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |
Beginning balance | 169,316,460 | 168,628,177 | 163,342,894
Stock options/SARs exercised | 0 | 77,002 | 195,242
Restricted stock grants | 490,609 | 335,103 | 270,062
Restricted stock units vested | 266,541 | 252,507 | 244,413
Shares retired | (739) | 0 | 0
Treasury shares | 28,736 | 23,671 | 15,566
Ending balance | 247,144,356 | 169,316,460 | 168,628,177
MRD |  |  |
Class Of Stock [Line Items] |  |  |
MRD Merger | 77,042,749 | 0 | 0
Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Equity offering | 77,799,000 | 665,000 | 5,270,000
Common Stock | Equity Offering |  |  |
Class Of Stock [Line Items] |  |  |
Equity offering | 0 | 0 | 4,560,000

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