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Share-based Compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Jan. 31, 2019 | Aug. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Feb. 25, 2019 | Jun. 29, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  | 1,301,314 | 1,175,887 |  |  |  |
Options exercisable |  |  |  | 896,836 |  |  |  |  |
Income tax benefit related to expense |  |  |  | $ 3,500,000 | $ 3,200,000 | $ 3,400,000 |  |  |
Exercised stock option amount |  |  |  | 2,800,000 |  |  |  |  |
Realized tax benefit amount |  |  |  | $ 300,000 |  |  |  |  |
Closing stock price |  |  |  | $ 46.18 |  |  |  |  |
Non-vested shares, vested in period |  |  |  | $ 2,700,000 | 0.0 | 0.0 |  |  |
Share-based compensation |  |  |  | 21,540,000 | 18,930,000 | 12,557,000 |  |  |
General and administrative [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  | 16,872,000 | 15,197,000 | 9,671,000 |  |  |
Transition and Retirement Agreement [Member] | General and administrative [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  | $ 6,500,000 |  |  |  |  |
Global Spine [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  | 50,711 |  |  |  |  |
Options exercisable |  |  |  | 0 |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  | 14,743 |  |  |  |  |  |
Share based compensation, vesting rights |  |  | 25.00% |  |  |  |  |  |
Global Spine [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Common stock acquire under stock option |  |  | 50,711 |  |  |  |  |  |
Options Medical Founder[Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted stock and stock units outstanding |  | 25,478 |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  | 25,478 |  |  |  |  |  |  |
Share based compensation, grant fair value of restricted stock units |  | $ 1,400,000 |  |  |  |  |  |  |
Share based compensation, vesting rights |  | 33.33% |  |  |  |  |  |  |
President and Chief Executive Officer [Member] | Transition and Retirement Agreement [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Transition consulting services payable per month |  |  |  |  |  |  |  | $ 40,000 |
President and Chief Executive Officer [Member] | Transition and Retirement Agreement [Member] | First Anniversary [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant date fair market value of restricted stock units | $ 2,000,000.0 |  |  |  |  |  |  |  |
2012 LTIP Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Award Contractual term |  |  |  | 10 years |  |  |  |  |
Amount of shares reserved for issuance |  |  |  | 4,750,000 |  |  |  |  |
Options outstanding |  |  |  | 1,067,947 |  |  |  |  |
Options exercisable |  |  |  | 714,180 |  |  |  |  |
2004 LTIP [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Amount of shares reserved for issuance |  |  |  |  |  |  |  |  | 3,100,000
Spinal Kinetics Inducement Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  | 7,156 |  |  |  |  |
Number of shares reserved for employees |  |  |  | 51,705 |  |  |  |  |
Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Amount of shares reserved for issuance |  |  |  | 2,350,000 |  |  |  |  |
Maximum percentage of compensation eligible employees to be deducted for purchase of common stock |  |  |  | 25.00% |  |  |  |  |
Purchase price of shares equivalent to fair market value |  |  |  | 85.00% |  |  |  |  |
Shares issued under stock purchase plan |  |  |  | 1,827,147 |  |  |  |  |
Stock Purchase Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of compensation eligible employees to be deducted for purchase of common stock |  |  |  | 1.00% |  |  |  |  |
Restricted Stock [Member] | Global Spine [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted stock and stock units outstanding |  |  |  | 14,743 |  |  |  |  |
Restricted Stock [Member] | 2012 LTIP Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted stock and stock units outstanding |  |  |  | 119,217 |  |  |  |  |
Restricted Stock [Member] | Spinal Kinetics Inducement Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted stock and stock units outstanding |  |  |  | 5,608 |  |  |  |  |
Restricted Stock Units [Member] | 2012 LTIP Plan [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted stock and stock units outstanding |  |  |  | 560,844 |  |  |  |  |
Market-based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  |  | 60,722 |  |  |  |  |
Unamortized compensation expense |  |  |  | $ 3,800,000 |  |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized |  |  |  | 1 year 2 months 12 days |  |  |  |  |
Aggregate intrinsic value of restricted stock outstanding |  |  |  | $ 11,900,000 | 14,200,000 | 10,200,000 |  |  |
Share-based compensation |  |  |  | $ 4,733,000 | 5,256,000 | 2,904,000 |  |  |
Common stock issued based on performance stock units |  |  |  | 1 |  |  |  |  |
Percentage of performance to be achieved |  |  |  | 100.00% |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |  |  |
Market-based Restricted Stock Units [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of performance to be achieved |  |  |  | 200.00% |  |  |  |  |
Market-based Restricted Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of performance to be achieved |  |  |  | 50.00% |  |  |  |  |
Staff Share Option Plan [Member] | 2004 LTIP [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  | 25,500 |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Service period |  |  |  | 4 years |  |  |  |  |
Unamortized compensation expense |  |  |  | $ 3,700,000 |  |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized |  |  |  | 1 year 8 months 12 days |  |  |  |  |
Total intrinsic value of options exercised |  |  |  | $ 1,400,000 | 3,200,000 | 2,200,000 |  |  |
Aggregate intrinsic value of options outstanding |  |  |  | 7,300,000 | 13,600,000 | 18,700,000 |  |  |
Aggregate intrinsic value of options exercisable |  |  |  | 6,700,000 | 11,000,000.0 | 12,400,000 |  |  |
Share-based compensation |  |  |  | $ 4,054,000 | 3,061,000 | 2,388,000 |  |  |
Time-based Restricted Stock Awards and Stock Units [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  |  | 319,189 |  |  |  |  |
Unamortized compensation expense |  |  |  | $ 15,300,000 |  |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized |  |  |  | 2 years 6 months |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |  |
Non-vested shares, vested in period |  |  |  | $ 9,500,000 | 8,000,000.0 | 7,300,000 |  |  |
Aggregate intrinsic value of restricted stock outstanding |  |  |  | 21,600,000 | 18,800,000 | 17,800,000 |  |  |
Share-based compensation |  |  |  | $ 11,084,000 | $ 7,265,000 | $ 5,540,000 |  |  |
Restricted Stock Unit with Deferred Delivery (DSUs) [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |  |  |
Awards vested but not settled |  |  |  | 47,077 |  |  |  |  |
Performance-based Restricted Stock Awards and Stock Units [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  |  | 0 | 0 | 0 |  |  |
Share-based compensation |  |  |  |  | $ 1,998,000 | $ 462,000 |  |  |
Performance-based Restricted Stock Awards [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  |  |  |  |  | 110,660 |  |
Unamortized compensation expense |  |  |  | $ 0 |  |  |  |  |
Non-vested shares, vested in period |  |  |  | 3,200,000 | 0.0 | 4,900,000 |  |  |
Aggregate intrinsic value of restricted stock outstanding |  |  |  | 0.0 | 2,900,000 | 3,000,000.0 |  |  |
Share-based compensation |  |  |  | 0 | 400,000 | 500,000 |  |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |
Share based compensation, grant of restricted stock units |  |  |  |  |  |  | 55,330 |  |
Unamortized compensation expense |  |  |  | 0 |  |  |  |  |
Aggregate intrinsic value of restricted stock outstanding |  |  |  | 0.0 | 2,500,000 | 3,000,000.0 |  |  |
Share-based compensation |  |  |  | $ 0.0 | $ 1,600,000 | $ 0.0 |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: 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=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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