Stockholders' Equity - Schedule of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning Balance \| shares	292
Number of Shares, Exercised \| shares	(43)
Number of Shares, Outstanding, Ending Balance \| shares	249
Number of Shares, Vested and Exercisable at June 30, 2021 \| shares	249
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance \| $ / shares	$ 35.46
Weighted - Average Exercise Price Per Share, Exercised \| $ / shares	35.78
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance \| $ / shares	35.41
Weighted - Average Exercise Price Per Share, Vested and Exercisable at June 30, 2021 \| $ / shares	$ 35.41
Weighted - Average Remaining Contractual Term, Outstanding at June 30, 2021	2 years 11 months 19 days
Weighted - Average Remaining Contractual Term, Vested and Exercisable at June 30, 2021	2 years 11 months 19 days
Aggregate Intrinsic Value, Outstanding at June 30, 2021 \| $	$ 2,583
Aggregate Intrinsic Value, Vested and Exercisable at June 30, 2021 \| $	$ 2,583

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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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.

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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.

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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.

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Number of share options (or share units) exercised during the current period.

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