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Capital Stock - Capital Stock (Detail)	6 Months Ended	12 Months Ended
Capital Stock - Capital Stock (Detail)	Jun. 30, 2013	Dec. 31, 2012
Equity [Line Items]
Beginning balance	162,514,098	161,131,547
Stock options/SARs exercised	235,369	926,425
Restricted stock granted	401,122	354,674
Restricted stock units vested	117,009	57,824
Treasury shares issued	26,497	43,628
Ending balance	163,294,095	162,514,098

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

Number of share options (or share units) exercised during the current period.