- Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan	2,300,000	5,873,103
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award grants vest period first	3 years
Weighted-average grant date fair value of stock options granted	$ 24.22	$ 36.22	$ 33.33
Intrinsic value of stock options exercised	$ 243	$ 12,422	$ 21,194
Unrecognized compensation expenses	$ 3,549
Recognized weighted average period	1 year 10 months 24 days
Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards grant term	10 years
Restricted Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award grants vest period first	1 year
Stock award grants vest period second	3 years
Weighted-average grant date fair value of stock options granted	$ 66.12	$ 110.34	$ 107.57
Recognized weighted average period	1 year 9 months 18 days
Total fair value of restricted common shares and units vested	$ 9,859	$ 7,418	$ 7,112
Unrecognized compensation expenses	$ 12,184
Restricted Stock And Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	332,981	313,345
Granted (in shares)	207,538
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	194,053	191,854
Weighted-average grant date fair value of stock options granted	$ 78.41	$ 110.40	$ 107.49
Total fair value of restricted common shares and units vested	$ 5,450	$ 8,256	$ 5,641
Share-based Payment Arrangement, Cash Used to Settle Award	$ 3,345	$ 13,302	$ 4,296
Granted (in shares)	110,823

Share Based Compensation Arrangement By Share Based Payment Award Terms Of Stock Option Award

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Share Based Compensation Arrangement By Share Based Payment Award Vesting Period Two

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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