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Capital Stock (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Stockholders' Equity Note [Abstract]    
Beginning balance 162,514,098 161,131,547
Stock options/SARs exercised 257,103 926,425
Restricted stock granted 401,122 354,674
Restricted stock units vested 118,324 57,824
Treasury shares issued 26,497 43,628
Ending balance 163,317,144 162,514,098