Unrecognized cost of unvested share-based compensation awards.

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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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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

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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- Definition

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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- 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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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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- Definition

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

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,779		$ 1,817	$ 7,672	$ 4,845
Stock options, outstanding	1,033,312			1,033,312		734,940
Number of shares available for future grant	2,906,351			2,906,351
Closing price of common stock	$ 55.46			$ 55.46
Weighted average grant date fair value of share-based awards granted				$ 18.56	$ 16.94
Total fair value of stock options vested				$ 2,113	$ 2,074
Total unrecognized compensation cost	$ 28,360			$ 28,360
Unrecognized compensation cost, weighted average remaining requisite service period				4 years 6 months 3 days
Employee Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				3 years
Employee Stock Option \| Minimum \| Vest Over Three Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting percentage				20.00%
Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				5 years
Incentive options, term				10 years
Employee Stock Option \| Maximum \| Vest Over Five Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting percentage				33.00%
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				1 year
Option To Purchase Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, outstanding	1,033,312		749,669	1,033,312	749,669
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, outstanding	707,716			707,716
Closing price of common stock	$ 55.46			$ 55.46
Aggregate intrinsic value of restricted stock units vested				$ 5,165	$ 3,480
Weighted average grant date fair value of restricted stock units granted				$ 35.13	$ 36.85
Total grant date fair value of restricted stock units vested				$ 4,065	$ 2,565
Employee Stock Option and Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period		9 years