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Capital Stock (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Stockholders' Equity Note [Abstract] |  |
Beginning balance | 163,342,894 | 162,514,098
SARs exercised | 48,280 | 278,916
Restricted stock granted | 74,553 | 401,122
Restricted stock units vested | 198,943 | 119,480
Treasury shares issued | 5,245 | 29,278
Ending balance | 163,669,915 | 163,342,894

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