Stockholders' Equity - Assumptions Used to Value Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	36.00%	44.00%
Expected volatility, minimum			36.00%	37.00%
Expected volatility, maximum			41.00%	44.00%
Risk-free interest rate	1.62%	0.74%
Risk-free interest rate, minimum			1.08%	0.74%
Risk-free interest rate, maximum			1.62%	1.71%
Suboptimal exercise factor	3.82	3.51
Weighted-average fair value (in dollars per share)	$ 241	$ 203	$ 254	$ 184
Total stock-based compensation expense	$ 101,583	$ 104,210	$ 208,813	$ 201,229
Total income tax impact on provision	$ 22,832	$ 22,834	$ 46,911	$ 44,143
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise factor			3.81	3.34
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal exercise factor			3.82	3.51

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

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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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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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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