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Stock Compensation Plans - Stock Option Transactions Under Various Stock-Based Employee Compensation Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning Balance, Shares	2,702,629
Granted, Shares	68,000
Exercised, Shares	(586,563)	(113,359)	(368,178)
Canceled, Shares	(59,180)
Outstanding, Ending Balance, Shares	2,124,886	2,702,629
Exercisable, Ending Balance, Shares	1,506,925
Outstanding, Beginning Balance, Weighted Average Exercise Price	$ 21.27
Granted, Weighted Average Exercise Price	$ 33.04
Exercised, Weighted-Average Exercise Price	$ 17.66
Canceled, Weighted Average Exercise Price	$ 31.57
Outstanding, Ending Balance, Weighted Average Exercise Price	$ 22.36	$ 21.27
Exercisable, Ending Balance, Weighted Average Exercise Price	$ 23.30
Outstanding, Ending balance, Weighted Average Remaining Contractual Term	6 years 1 month 24 days
Exercisable, Ending Balance, Weighted Average Remaining Contractual Term	5 years 10 months 21 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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