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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