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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 |  |  |  |

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- Definition Share-based compensation arrangement by share-based payment award post-termination exercise period original term. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award post-termination exercise period revised term. + References No definition available. + Details
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- Definition Stock shares issued net of shares for tax withholdings. + References No definition available. + Details
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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 + Details
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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. + Details
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