Stockholders' Equity - Summary of Assumptions Used to Value Stock Option Grants Using Lattice-Binomial Model (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	42.00%	34.00%
Risk-free interest rate	2.90%	2.37%
Suboptimal exercise factor	2.93	2.51
Share-based payment award, expiration period (in years)			10 years
Dividend yield	0.00%	0.00%	0.00%	0.00%
Weighted-average fair value (in dollars per share) \| $ / shares	$ 161.39	$ 67.21	$ 141.62	$ 64.67
Stock-based compensation expense	$ 81,232	$ 44,028	$ 149,627	$ 88,916
Total income tax impact on provision (in thousands)	$ 16,889	$ 14,477	$ 31,580	$ 29,178
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			40.00%	34.00%
Risk-free interest rate			2.61%	2.37%
Suboptimal exercise factor			2.80	2.48
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			42.00%	37.00%
Risk-free interest rate			2.90%	2.45%
Suboptimal exercise factor			2.93	2.51

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

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (h)(1)(i)
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (f)(2)(iii)
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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.

+ References

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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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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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