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Share-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Shares issued under stock purchase plan, stock option exercises and restricted stock awards and units	211,081	126,511
Share-based compensation expense	$ 5,685	$ 3,916
Transition and Retirement Agreement [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share based compensation, post-termination exercise period original term	18 months
Maximum [Member] | Transition and Retirement Agreement [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share based compensation, post-termination exercise period revised term	4 years
President and Chief Executive Officer [Member] | Transition and Retirement Agreement [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,100

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- Definition

Share-based compensation arrangement by share-based payment award post-termination exercise period original term.

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- Definition

Share-based compensation arrangement by share-based payment award post-termination exercise period revised term.

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- Definition

Stock shares issued net of shares for tax withholdings.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
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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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