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After tax payroll deductions percentage of compensation, maximum.

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After tax payroll deductions percentage of compensation, minimum.

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Discount on common stock under management stock purchase program.

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Minimum annual bonus required to purchase restricted stock.

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Minimum number of years for accelerated vesting.

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Number of employee stock purchase plan.

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Percentage discount on stock for domestic and foreign employees.

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Percentage of target payout on which performance based restricted stock units are based.

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Reduction in the number of total shares for each award of other share based awards, per share.

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Reduction In Number Of Total Shares Available For Each Stock Option And Stock Appreciation Right Granted

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Share Based Compensation Arrangement by Share Based Payment Award, Options, Contractual Term One

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Stock available to purchase during period Employee stock purchase plan.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.

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Share-Based Compensation Plans - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Apr. 18, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employee stock purchase programs		2
Unrecognized compensation expenses related to share-based payment arrangements		$ 101,900,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		2 years
Share-based compensation		52,100,000	55,500,000	58,200,000
Cash received from stock option exercises		83,300,000	102,300,000	32,100,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		27,900,000
Awards requisite service period		4 years
Award contractual terms		10 years
Share-based compensation		15,800,000	19,700,000	22,100,000
Minimum number of years for accelerated vesting		2 years
Stock options vested		1,152,890	489,648	1,105,398
Weighted average fair value of stock options vested		$ 21.49	$ 22.80	$ 29.40
Total intrinsic value of stock options exercised		42,100,000	88,700,000	21,300,000
Cash received from stock option exercises		89,600,000	106,500,000	34,300,000
Actual tax benefit realized from option exercises		14,500,000	31,600,000	7,100,000
Fair value assumptions, risk-free interest rate		0.90%	1.03%	1.29%
Fair value assumptions, dividend yield		0.80%	0.80%	0.90%
Fair value assumptions, expected life in years		7 years	7 years	7 years 2 months 12 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		39,900,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		2 years
Share-based compensation		18,700,000	22,100,000	21,500,000
Weighted average fair value of stock options vested		$ 85.24
Nonvested other stock-based awards, shares outstanding		1,055,625	1,121,765
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards requisite service period		4 years
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards requisite service period		7 years
Other Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		22,500,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		3 years
Share-based compensation		5,100,000	4,600,000	4,800,000
Other Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards requisite service period		4 years
Other Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards requisite service period		7 years
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		6,300,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		2 years
Awards requisite service period		3 years
Share-based compensation		2,600,000
Fair value assumptions, risk-free interest rate		0.41%
Fair value assumptions, dividend yield		0.85%
Fair value assumptions, expected life in years		2 years 9 months 29 days
Performance Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target payout of employee varying from actual payout under award		0.00%
Performance Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target payout of employee varying from actual payout under award		200.00%
Other Stock-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		500,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		2 years
Share-based compensation		900,000	1,000,000	1,200,000
Nonvested other stock-based awards, shares outstanding		23,107	20,867
Management Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to share-based payment arrangements		4,800,000
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years		3 years
Share-based compensation		6,200,000	5,600,000	6,500,000
Discount on common stock under management stock purchase program		30.00%
Minimum annual bonus percentage required to purchase restricted stock		25.00%
Vesting period, years		4 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized	750,000
Share-based compensation		2,800,000	2,500,000	2,100,000
Fair value assumptions, risk-free interest rate		0.11%	0.16%	0.20%
Fair value assumptions, dividend yield		0.90%	0.80%	0.90%
Fair value assumptions, expected life in years		6 months	6 months	6 months
Percentage discount on stock for domestic and foreign employees		15.00%
After tax payroll deductions percentage of compensation, minimum		1.00%
After tax payroll deductions percentage of compensation, maximum		10.00%
Payroll deductions maximum amount of compensation		$ 25,000
Shares available to purchase during period under Employee Stock Purchase Plan		644,416
Shares purchased under Employee Stock Purchase Plan		147,858	139,596
Plan Of 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of remaining shares that may be issued		4,507,271
Additional shares authorized	2,750,000
Reduction in the number of total shares for each stock option or stock appreciation rights granted, per share	1
Reduction in the number of total shares for each award of other share based awards, per share	2.87
Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of remaining shares that may be issued		39,259