Orthotec Settlement - Additional Information (Details) - Orthotec LLC, litigation settlement			1 Months Ended		24 Months Ended
	Oct. 01, 2014 USD ($)	Aug. 13, 2014 USD ($) installment	Apr. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Judgment assessed by court for (against) company		$ (49,000,000)
Payments of settlement			$ 15,750,000	$ 1,750,000	$ 26,300,000
Loss contingency accrual					$ 24,800,000
Number of quarterly installments | installment		28
Litigation settlement interest, quarterly installments, amount		$ 1,100,000
Beginning fourth quarter of 2014
Loss Contingencies [Line Items]
Settlement amount, remaining balance	$ 31,500,000
Litigation settlement payments, quarterly payment amount		$ 1,100,000
Litigation settlement interest rate		7.00%
Litigation settlement interest, quarterly installments, amount		$ 1,100,000
Final installment
Loss Contingencies [Line Items]
Number of quarterly installments | installment		1
Litigation settlement, final installment amount		$ 700,000.0