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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%