Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	9 Months Ended
Sep. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding at December 31, 2018 (in shares) \| shares	343,000
Options exercised (in shares) \| shares	(166,000)
Options outstanding at September 30, 2019 (in shares) \| shares	177,000
Weighted Average Exercise Price at December 31, 2018 (in USD per share)	$ 16.67
Weighted Average Exercise Price of Options Exercised (in USD per share)	15.93
Weighted Average Exercise Price at September 30, 2019 (in USD per share)	17.52
Minimum
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share)	14.54	$ 12.63
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	12.63
Maximum
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share)	23.21	$ 23.21
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	$ 19.46

Share based compensation arrangements by share based payment award options outstanding option price per share.

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Share Based Compensation Arrangements By Share Based Payment Award Options Outstanding Option Price Per Share of Options Exercised

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- Definition

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

+ References

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- Definition

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

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

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

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