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

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Stock shares issued net of shares for tax withholdings.

+ References

No definition available.

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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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

+ References

No definition available.

+ Details

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- Definition

Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

No definition available.

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Share-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 05, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 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		40,812	80,444	251,893	206,955
Share-based compensation expense		$ 5,849	$ 5,215	$ 11,534	$ 9,131
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		$ 1,500		$ 3,700
Subsequent Event [Member] \| Employment Agreement [Member] \| Global Spine [Member] \| Inducement Grants [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share issued under restricted stock units and stock options, value	$ 1,500