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Shareholders' Equity - Company's Repurchasing Activity by Repurchase Plan (Detail) (USD $)	228 Months Ended	144 Months Ended
	Dec. 31, 2012 Non-Discretionary Plan	Dec. 31, 2012 Discretionary Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative shares repurchased	24,444,917	27,871,019
Average price per share	$ 23.46	$ 35.71

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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