| **Stock-Based Compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands** | 12 Months Ended        |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                            |                   |
| Number of Options, Outstanding, Beginning balance (in shares) | shares                                                                                        | 1,787                  |
| Number of Options, Granted (in shares) | shares                                                                                                               | 391                    |
| Number of Options, Exercised (in shares) | shares                                                                                                             | (644)                  |
| Number of Options, Forfeited or expired (in shares) | shares                                                                                                  | (47)                   |
| Number of Options, Outstanding, Ending balance (in shares) | shares                                                                                           | 1,487                  |
| Number of Options, Expected to vest (in shares) | shares                                                                                                      | 845                    |
| Number of Options, Exercisable (in shares) | shares                                                                                                           | 632                    |
| Weighted-Average Exercise Price Per Share, Outstanding, Beginning balance (in dollars per share) | $ / shares                                                 | $ 97.74                |
| Weighted-Average Exercise Price Per Share, Granted (in dollars per share) | $ / shares                                                                        | 166.38                 |
| Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) | $ / shares                                                                      | 78.91                  |
| Weighted-Average Exercise Price Per Share, Forfeited or expired (in dollars per share) | $ / shares                                                           | 145.52                 |
| Weighted-Average Exercise Price Per Share, Outstanding, Ending balance (in dollars per share) | $ / shares                                                    | 122.45                 |
| Weighted-Average Exercise Price Per Share, Expected to vest (in dollars per share) | $ / shares                                                               | 141.28                 |
| Weighted-Average Exercise Price Per Share, Exercisable (in dollars per share) | $ / shares                                                                    | $ 96.79                |
| Aggregate Intrinsic Value, Outstanding | $                                                                                                                    | $ 105,536              |
| Aggregate Intrinsic Value, Expected to vest | $                                                                                                               | 44,065                 |
| Aggregate Intrinsic Value, Exercisable | $                                                                                                                    | $ 61,104               |
| Weighted Average Remaining Term, Outstanding                                                                                                                  | 7 years                |
| Weighted Average Remaining Term, Expected to vest                                                                                                             | 8 years 1 month 6 days |
| Weighted Average Remaining Term, Exercisable                                                                                                                  | 5 years 6 months       |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-based compensation arrangement by share-based payment award options expected to vest outstanding aggregate intrinsic value.
+ References
No definition available.
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| - Definition
Share-based compensation arrangement by share-based payment award options expected to vest outstanding number.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-based compensation arrangement by share-based payment award options expected to vest outstanding weighted average exercise price.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| - Definition
Share-based compensation arrangement by share-based payment award options expected to vest outstanding weighted average remaining contractual term.
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No definition available.
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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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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For presentations that combine terminations, 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 or that expired.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price of options that were either forfeited or expired.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gross number of share options (or share units) granted during the period.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of options outstanding, including both vested and non-vested options.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.
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No definition available.
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| - Definition
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.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
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