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Capital Stock (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class Of Stock [Line Items] |  |  |
Beginning balance | 168,628,177 | 163,342,894 | 162,514,098
Stock options/SARs exercised | 77,002 | 195,242 | 278,916
Restricted stock grants | 335,103 | 270,062 | 401,122
Restricted stock units vested | 252,507 | 244,413 | 119,480
Treasury shares | 23,671 | 15,566 | 29,278
Ending balance | 169,316,460 | 168,628,177 | 163,342,894
Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Equity offering | 665,000 | 5,270,000 | 799,000
Common Stock | Equity Offering |  |  |
Class Of Stock [Line Items] |  |  |
Equity offering | 0 | 4,560,000 | 0

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