Stock Option Plans - Summary of Stock Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Stock Options Outstanding, Shares
Shares Outstanding, December 31, 2012	6,610
Stock options granted (in shares)	2,394
Shares Exercised	(1,566)
Shares Forfeited	(311)
Shares Outstanding, December 31, 2013	7,127	6,610
Stock Options Outstanding, Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding, December 31, 2012 (in usd per share)	$ 12.49
Weighted Average Exercise Price, Granted (in usd per share)	$ 43.32
Weighted Average Exercise Price, Exercised (in usd per share)	$ 8.58
Weighted Average Exercise Price, Forfeited (in usd per share)	$ 27.00
Weighted Average Exercise Price, Outstanding, December 31, 2013 (in usd per share)	$ 23.07	$ 12.49
Stock Options, Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	8 years 1 month 6 days	8 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding	$ 215,549	$ 112,899
Shares Exercisable at December 31, 2013	2,890
Weighted Average Exercise Price, Exercisable at December 31, 2013 (in usd per share)	$ 10.46
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2013	7 years
Aggregate Intrinsic Value, Exercisable at December 31, 2013	123,833
Stock Options Vested and Expected to Vest
Shares Vested and Expected to Vest at December 31, 2013	7,022
Weighted Average Exercise Price, Vested and Expected to Vest at December 31, 2013 (in usd per share)	$ 22.91
Weighted Average Remaining Contractual Term, Vested and Expected to Vest at December 31, 2013	8 years 1 month 6 days
Aggregate Intrinsic Value, Vested and Expected to Vest at December 31, 2013	$ 213,492

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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