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Capital Stock (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Stockholders' Equity Note [Abstract] |  |
Beginning balance | 163,342,894 | 162,514,098
Public offering | 4,560,000 |
SARs exercised | 188,305 | 278,916
Restricted stock granted | 266,453 | 401,122
Restricted stock units vested | 237,620 | 119,480
Treasury shares issued | 15,336 | 29,278
Ending balance | 168,610,608 | 163,342,894

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