SEGMENT AND GEOGRAPHIC INFORMATION - Revenue by Major Product Category (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Revenues	$ 231,351	$ 205,547	$ 446,410	$ 402,199
Orthopedics
Revenue from External Customer [Line Items]
Revenues	93,069	90,377	180,308	179,737
Neurosurgery
Revenue from External Customer [Line Items]
Revenues	93,258	68,459	177,628	131,644
Instruments
Revenue from External Customer [Line Items]
Revenues	$ 45,024	$ 46,711	$ 88,474	$ 90,818

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration