Stock Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Summary of Stock Option and RSA Activity
Beginning Balance, Shares	18,615
Granted, shares	295
Exercised, shares	(5,893)
Forfeited, shares	(242)
Expired, shares	(46)
Ending Balance, Shares	12,729
Beginning balance, weighted average exercise price	$ 44.98
Granted, weighted average exercise price	$ 86.64
Exercised, weighted average exercise price	$ 48.05
Forfeitures, weighted average exercise price	$ 51.83
Expired, weighted average exercise price	$ 47.84
Ending balance, weighted average exercise price	$ 44.39
Options vested and expected to vest, shares	12,726
Options vested and expected to vest, Weighted Average Exercise Price	$ 44.39
Options exercisable, shares	11,628
Options exercisable, Weighted Average Exercise Price	$ 42.64
Beginning balance, shares	9,578
Granted, shares	2,639
Vested, shares	(3,427)
Forfeited, shares	(916)
Ending balance, shares	7,874
Beginning Balance, Weighted Average Grant Price	$ 51.88
Granted, Weighted Average Grant Price	$ 86.65
Vested, Weighted Average Grant Price	$ 47.25
Forfeited, Weighted Average Grant Price	$ 60.98
Ending Balance, Weighted Average Grant Price	$ 64.48

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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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 price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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

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