Maximum percentage of employees on stockholders to participate in employee stock purchase plan.

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- Definition

Maximum percentage of payroll deduction under ESPP.

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Minimum exercise price of NSOs, percentage of fair value.

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- Definition

Minimum hours employed per week to participate in employee stock purchase plan.

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Minimum months employed per year to participate in employee stock purchase plan.

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- Definition

Offering Period, Employee Stock Purchase Plans

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Offering Period, Number of Purchase Periods Offering Divided Into, Employee Stock Purchase Plans

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Offering Period, Period Offering Divided Into, Employee Stock Purchase Plans

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Period of Look-Back That Could Cause Offering Period to Reset, Employee Stock Purchase Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting at the End of One Month

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Per Month After One Year

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Per Month After Six Months of Service

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Upon One Year of Service

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Upon Six Months of Service

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Reduction in the maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Stock options granted initial vesting period.

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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB

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-Topic 210

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Unrecognized cost of unvested share-based compensation awards.

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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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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Percentage of vesting of share-based compensation awards.

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Discount rate from fair value on offering date that participants pay for shares.

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Discount rate from fair value on purchase date that participants pay for shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 25, 2013	Apr. 24, 2013	May 31, 2013	Jan. 31, 2013	Oct. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised under stock option plans	$ 146.2	$ 130.2	$ 375.7
Cash received from option exercises and employee stock purchase plans	283.6	160.6	263.3
Number of options vested and expected to vest	4,800,000
Weighted average remaining contractual life of shares vested and expected to vest, years	6 years 6 months
Aggregate intrinsic value of shares vested and expected to vest	672.2
Options vested and expected to vest, weighted-average exercise price per share	$ 393.76
Excess tax benefit from employee stock plans	24.0	38.0	94.2
Share-based compensation charges, income tax effect	53.5	58.5	47.5
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance				4,850,000	3,650,000
Shares were reserved for future issuance	1,000,000
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance						1,155,000	855,000
Shares were reserved for future issuance	100,000
2000 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Minimum exercise price of NSOs, percentage of fair value	85.00%
2000 Non-Employee Directors' Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Shares were reserved for future issuance	58,000
Reduction under Directors' plan, shares								150,000
Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
Annual Grant Options \| 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	3 years 6 months
Annual Grant Options \| 2000 Non-Employee Directors' Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	1 year
New Hire Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon one year of service	25.00%
Percentage vesting per month after one year	2.0833%
Initial Grant Options \| 2000 Non-Employee Directors' Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon one year of service	33.3333%
Percentage vesting per month after one year	2.7778%
Stock options granted initial vesting period, years	3 years
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance	300,000
Minimum hours employed per week	20 hours
Minimum months employed per year	5 months
Maximum percentage of employees on stockholders to participate in ESPP	5.00%
Percentage of employee payroll deduction under the stock plan, maximum	15.00%
Duration for each offering period	24 months
Number of shorter purchase periods that each offering period is divided into	4
Duration of each shorter offering period	6 months
Discount on fair market value on the offering date	85.00%
Discount on fair market value on the purchase date	85.00%
Period of look-back that could cause offering period to reset	2 years
Employee stock purchase plan, shares issued	100,000	100,000	100,000
Employee stock purchase plan, value of shares issued	29.4	28.8	27.8
Total unrecognized compensation expense	7.3
Weighted average period unrecognized compensation expenses are expected to be recognized, years	8 months 12 days
Nonvested Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense	177.1
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 3 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	4 years
Total unrecognized compensation expense	$ 65.9
Weighted average period unrecognized compensation expenses are expected to be recognized, years	3 years 2 months 12 days
February Grant \| Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
August Grant \| Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting at the end of one month	14.5833%
Percentage vesting per month after one month	2.0833%