Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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
Stock award grants vest period second	4 years
Stock award grants vest period third	5 years
Weighted-average grant date fair value of stock options granted	$ 33.33	$ 20.26	$ 17.28
Intrinsic value of stock options exercised	$ 21,194	$ 31,153	$ 2,307
Unrecognized compensation expenses	$ 3,702
Recognized weighted average period	1 year 4 months 13 days
Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards grant term	7 years
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
Stock award grants vest period third	4 years
Weighted-average grant date fair value of stock options granted	$ 107.57	$ 70.09	$ 56.85
Recognized weighted average period	1 year 9 months 14 days
Total fair value of restricted common shares and units vested	$ 7,112	$ 5,923	$ 4,146
Unrecognized compensation expenses	$ 12,301
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	354,047	371,559
Granted (in shares)	118,562
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	229,893	247,967
Weighted-average grant date fair value of stock options granted	$ 107.49	$ 68.71	$ 56.74
Recognized weighted average period	1 year 3 months 18 days
Total fair value of restricted common shares and units vested	$ 5,641	$ 0	$ 0
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards	4,296
Unrecognized compensation expenses	$ 6,014
Granted (in shares)	66,514
TSR-based Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses	$ 1,357	$ 0

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 Three

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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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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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