Business Combinations (Details Textual) - USD ($)			3 Months Ended		8 Months Ended	9 Months Ended		12 Months Ended
	Jul. 02, 2016	Feb. 11, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2009	Mar. 31, 2016
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						9 years		10 years
Amortization expense related to intangible assets			$ 12,300,000	$ 4,000,000		$ 32,600,000	$ 11,700,000
Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						8 years		9 years
Customer-Related Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						9 years		8 years
Ellipse Technologies Inc [Member]
Business Acquisition [Line Items]
Business acquisition. date of acquisition						Feb. 11, 2016
Business acquisition, purchase price		$ 380,000,000
Business acquisition, potential future milestone payment		30,000,000
Cash payment on purchase of outstanding shares		$ 381,579,000
Contingent liability			21,600,000		$ 21,600,000	$ 21,600,000				$ 18,800,000
Revenue from operation of NSO			15,000,000			35,800,000
Income (loss) from operation of NSO			900,000			100,000
Ellipse Technologies Inc [Member] | Amortization Charges [Member]
Business Acquisition [Line Items]
Amortization expense related to intangible assets				$ 6,500,000			19,500,000
Ellipse Technologies Inc [Member] | Fair Value Adjustment To Inventory [Member]
Business Acquisition [Line Items]
Fair value adjustment of acquired inventory						(14,700,000)	14,700,000
Ellipse Technologies Inc [Member] | Acquisition Related Costs [Member]
Business Acquisition [Line Items]
Acquisition costs related to merger							$ 4,000,000
Ellipse Technologies Inc [Member] | Selling, Marketing and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition costs related to merger						$ 4,000,000
Ellipse Technologies Inc [Member] | Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						7 years
Ellipse Technologies Inc [Member] | Customer-Related Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						9 years
Ellipse Technologies Inc [Member] | Trade Name Related Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, weighted-average useful life						7 years
Ellipse Technologies Inc [Member] | Traditional Working Capital Adjustments [Member]
Business Acquisition [Line Items]
Escrow cash received					600,000
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition. date of acquisition						Jul. 01, 2016
Business acquisition, purchase price	$ 98,000,000
Cash payment on purchase of outstanding shares	$ 94,000,000
Progentix Orthobiology [Member]
Business Acquisition [Line Items]
Advanced loan accordance to loan agreement			$ 5,300,000		$ 5,300,000	$ 5,300,000
Accrued interest rate of loan			6.00%		6.00%	6.00%
Progentix Orthobiology [Member] | Preferred Stock Purchase Agreement [Member]
Business Acquisition [Line Items]
Cash payment on purchase of outstanding shares									$ 10,000,000
Percentage of ownership Interests acquired									40.00%