Acquisition of Spinal Kinetics, Inc. - Summary of Unaudited Pro forma Results (Detail) - Spinal Kinetics [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Net sales	$ 457,960	$ 448,277
Net income (loss) from continuing operations	$ 16,157	$ (1,492)

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.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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