Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 11,709	$ 9,061	$ 7,986
Weighted-average grant date fair value of stock options granted (in dollars per share)	$ 18.76	$ 8.99	$ 6.00
Total intrinsic value for options exercised	$ 38,200	$ 26,800	$ 4,500
Total unrecognized compensation expense related to non-vested stock options	$ 4,400
Expected weighted-average period of recognition for unrecognized compensation expense	1 year 8 months 12 days
Maximum contractual term	10 years
Deferred Bonus Liability		900	500
Deferred bonus compensation program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 1,600	100	900
Recorded as a component of accrued payroll and related expenses	1,600	900
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	3,400	4,100	4,700
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 6,700	$ 4,900	$ 2,400
Number of restricted share units issued (in shares)	0.1
Total unrecognized compensation expense related to non-vested stock awards	$ 12,100

Deferred bonus liability.

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- Definition

Share based compensation arrangement by share based payment award options outstanding weighted average remaining contractual term two maximum.

+ References

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- Definition

Stock based compensation expenses included in accrued payroll and related expenses.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

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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- Definition

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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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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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- Definition

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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- 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 share instruments newly issued under a share-based compensation plan.

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