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Share-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 05, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 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 |  | 43,603 | 50,928 | 295,496 | 257,833
Share-based compensation expense |  | $ 5,844 | $ 5,261 | $ 17,378 | $ 14,392
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 |  | $ 2,200 |  | $ 5,900 |
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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