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Share-based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 29, 2004
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Options outstanding | 1,175,887 | 1,086,822 |  |  |
Options exercisable | 696,248 |  |  |  |
Income tax benefit related to expense | $ 3,800,000 | $ 3,400,000 | $ 4,300,000 |  |
Exercised stock option amount | 2,800,000 |  |  |  |
Realized tax benefit amount | $ 800,000 |  |  |  |
Closing stock price | $ 52.49 |  |  |  |
Share-based compensation | $ 18,930,000 | 12,557,000 | 15,966,000 |  |
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 | 971,763 |  |  |  |
Options exercisable | 520,748 |  |  |  |
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 | 28,624 |  |  |  |
Options exercisable | 0 |  |  |  |
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 | 1,628,045 |  |  |  |
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] | 2012 LTIP Plan [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unvested restricted stock and stock units outstanding | 339,452 |  |  |  |
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 | 19,914 |  |  |  |
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 | 371,676 |  |  |  |
Staff Share Option Plan [Member] | 2004 LTIP [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Options outstanding | 25,500 |  |  |  |
Unvested restricted stock and stock units outstanding | 0 |  |  |  |
Stock Option [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Service period | 4 years |  |  |  |
Unamortized compensation expense | $ 3,000,000.0 |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 1 year 4 months 24 days |  |  |  |
Total intrinsic value of options exercised | $ 3,200,000 | 2,200,000 | 4,300,000 |  |
Aggregate intrinsic value of options outstanding | 13,600,000 | 18,700,000 | 3,300,000 |  |
Aggregate intrinsic value of options exercisable | 11,000,000.0 | 12,400,000 | 2,200,000 |  |
Share-based compensation | 3,061,000 | 2,388,000 | 2,021,000 |  |
Time-based Restricted Stock Awards and Stock Units [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unamortized compensation expense | $ 12,200,000 |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 2 years 4 months 24 days |  |  |  |
Non-vested shares | 172,108 |  |  |  |
Vesting period | 4 years |  |  |  |
Non-vested shares, vested in period | $ 8,000,000.0 | 7,300,000 | 7,200,000 |  |
Aggregate intrinsic value of restricted stock outstanding | 18,800,000 | 17,800,000 | 13,000,000.0 |  |
Share-based compensation | $ 7,265,000 | $ 5,540,000 | $ 6,016,000 |  |
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 | 27,982 |  |  |  |
Performance-based Restricted Stock Awards and Stock Units [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Non-vested shares | 0 | 0 | 0 |  |
Share-based compensation | $ 1,998,000 | $ 462,000 | $ 5,716,000 |  |
Performance-based Restricted Stock Awards [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unamortized compensation expense | 0 |  |  |  |
Non-vested shares |  |  |  | 110,660 |
Non-vested shares, vested in period | 0 | 4,900,000 | 0 |  |
Aggregate intrinsic value of restricted stock outstanding | 2,900,000 | 3,000,000.0 | 7,000,000.0 |  |
Share-based compensation | 400,000 | 500,000 | 5,700,000 |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unamortized compensation expense | 0 |  |  |  |
Non-vested shares |  |  |  | 55,330 |
Aggregate intrinsic value of restricted stock outstanding | 2,500,000 | 3,000,000.0 | 2,000,000.0 |  |
Share-based compensation | 1,600 | $ 0 | $ 0 |  |
Market-based Restricted Stock Units [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unamortized compensation expense | $ 6,500,000 |  |  |  |
Weighted-average period for unamortized compensation cost expected to be recognized | 1 year 4 months 24 days |  |  |  |
Non-vested shares | 97,420 | 94,902 | 96,245 |  |
Aggregate intrinsic value of restricted stock outstanding | $ 14,200,000 | $ 10,200,000 | $ 3,500,000 |  |
Share-based compensation | $ 5,256,000 | $ 2,904,000 | $ 948,000 |  |
Common stock issued based on performance stock units | 1 |  |  |  |
Percentage of performance to be achieved | 100.00% |  |  |  |
Market-based Restricted Stock Units [Member] | April 2018 Grant Date [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Performance period | 3 years |  |  |  |
Market-based Restricted Stock Units [Member] | July 2017 Grant Date [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Performance period | 3 years |  |  |  |
Market-based Restricted Stock Units [Member] | July 2016 Grant Date [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Performance period | 3 years |  |  |  |
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% |  |  |  |
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% |  |  |  |

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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 Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=109197908&loc=d3e5070-113901 + Details
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