Stockholders' Equity - Summary of Assumptions Used to Value Stock Option Grants Using Lattice-Binomial Model (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	36.00%	45.00%	36.00%
Expected volatility, minimum				45.00%
Expected volatility, maximum				48.00%
Risk-free interest rate	2.05%	2.66%
Risk-free interest rate, minimum			2.03%	2.66%
Risk-free interest rate, maximum			2.05%	2.83%
Suboptimal exercise factor	247.00%
Suboptimal exercise factor, minimum		2.66%	2.47%	2.66%
Suboptimal exercise factor, maximum		4.20%	2.48%	4.20%
Weighted-average fair value (per share)	$ 32.52	$ 28.13	$ 29.24	$ 29.69
Total stock-based compensation expense (in thousands)	$ 28,590	$ 29,285	$ 56,031	$ 55,110
Total income tax benefit related to stock options (in thousands)	$ 10,796	$ 11,225	$ 21,188	$ 21,124

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

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The maximum factor at which the company expects the share price to be compared to the share option exercise price when the employee exercises.

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The minimum factor at which the company expects the share price to be compared to the share option exercise price when the employee exercises.

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Section F

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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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- Definition

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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