Stockholders' Equity - Summary of Assumptions Used to Value Stock Option Grants Using Lattice-Binomial Model (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	45.00%	43.00%
Expected volatility, minimum			36.00%	43.00%
Expected volatility, maximum			45.00%	48.00%
Risk-free interest rate	2.29%	2.52%
Risk-free interest rate, minimum			2.03%	2.52%
Risk-free interest rate, maximum			2.29%	2.83%
Suboptimal exercise factor	2.48
Suboptimal exercise factor, minimum		2.68	2.47	2.66
Suboptimal exercise factor, maximum		4.57	2.48	4.57
Weighted-average fair value (in dollars per share) \| $ / shares	$ 50.58	$ 33.85	$ 34.64	$ 31.03
Total stock-based compensation expense (in thousands)	$ 32,834	$ 29,878	$ 88,865	$ 84,988
Total income tax benefit related to stock options (in thousands)	$ 12,365	$ 11,438	$ 33,553	$ 32,562

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor, Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor, Minimum

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Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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- Definition

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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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