Acquisitions - Schedule of Fair Value of Consideration Transferred (Detail) - Spinal Kinetics [Member] - USD ($) $ in Thousands	Apr. 30, 2018	Dec. 31, 2019
Fair value of consideration transferred
Cash paid	$ 51,109
Contingent consideration	25,491
Total fair value of consideration transferred	$ 76,600	$ 76,600

No definition available.

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- Definition

The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

+ References

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-Publisher FASB
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-SubTopic 20
-Section 50
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- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
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