REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenues Disaggregated by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total revenue, net	$ 383,315	$ 365,854	$ 366,190	$ 357,082	$ 368,602	$ 278,834	$ 282,164	$ 258,636	$ 1,472,441	$ 1,188,236	$ 992,075
Codman Specialty Surgical
Disaggregation of Revenue [Line Items]
Total revenue, net									963,929	720,301	632,524
Codman Specialty Surgical | Neurosurgery
Disaggregation of Revenue [Line Items]
Total revenue, net									684,148	446,994	367,985
Codman Specialty Surgical | Precision Tools and Instruments
Disaggregation of Revenue [Line Items]
Total revenue, net									279,781	273,307	264,539
Orthopedics and Tissue Technologies
Disaggregation of Revenue [Line Items]
Total revenue, net									508,512	467,935	359,551
Orthopedics and Tissue Technologies | Wound Reconstruction
Disaggregation of Revenue [Line Items]
Total revenue, net									305,465	269,068	178,524
Orthopedics and Tissue Technologies | Extremity Orthopedics
Disaggregation of Revenue [Line Items]
Total revenue, net									96,688	98,876	97,067
Orthopedics and Tissue Technologies | Private Label
Disaggregation of Revenue [Line Items]
Total revenue, net									$ 106,359	$ 99,991	$ 83,960