Goodwill - Schedule of Changes in Net Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Beginning balance	$ 73,094	$ 73,598
Foreign currency	1,294	(504)
Ending balance	74,388	73,094
Spine [Member]
Goodwill [Line Items]
Beginning balance	41,419	41,458
Foreign currency	145	(39)
Ending balance	41,564	41,419
Orthopedics [Member]
Goodwill [Line Items]
Beginning balance	31,675	32,140
Foreign currency	1,149	(465)
Ending balance	$ 32,824	$ 31,675