Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Cash paid, net of cash acquired							$ 16,854	$ 31,585
Acquisition-related costs	$ 0						400
General and administrative expenses
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Acquisition-related costs	100						600
2020 Acquisition activity, O&P business
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Cash paid, net of cash acquired		$ 16,762
Issuance of seller notes at fair value		21,941
Deferred payment obligations		3,468
Additional consideration		3,975
Aggregate purchase price		46,146
Accounts receivable		3,182
Inventories		2,021
Other assets and liabilities, net		(4,301)
Net assets acquired		6,702
Goodwill		39,444
Operating right-of-use assets	4,700						4,700
Operating lease liabilities	$ 4,700						$ 4,700
Consideration through settlement of amounts due from acquiree		400
2020 Acquisition activity, O&P business | Customer Relationships
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Other intangible assets, net		$ 5,600
Weighted average useful life		5 years
2020 Acquisition activity, O&P business | Non-compete agreements
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Other intangible assets, net		$ 200
Weighted average useful life		5 years
2020 Acquisition activity, O&P business | Payable in lump sum payment due in October 2020
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Issuance of seller notes at fair value		$ 18,100
Additional consideration		3,600
2020 Acquisition activity, O&P business | Payable in annual installments over a period of 3 years
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Issuance of seller notes at fair value		3,800
Deferred payment obligations		$ 3,500
Beginning period for the deferred payment obligations payable		4 years
Thereafter period for payable deferred payment obligations		3 years
2019 Acquisition Activity, prosthetic and orthotic business
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Cash paid, net of cash acquired			$ 5,000	$ 3,000	$ 200	$ 27,700			$ 35,909
Issuance of seller notes at fair value			2,800	300	300	4,400			7,835
Additional consideration				700		700			626
Aggregate purchase price			7,800	$ 3,300	$ 500	$ 32,800			44,370
Accounts receivable			4,128						4,128
Inventories			2,081						2,081
Other assets and liabilities, net			(2,983)						(2,983)
Net assets acquired			10,614						10,614
Goodwill									33,756
Operating right-of-use assets			5,200						5,200
Operating lease liabilities			5,200						5,200
2019 Acquisition Activity, prosthetic and orthotic business | Customer Relationships
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Other intangible assets, net			7,038						$ 7,038
Weighted average useful life									4 years 8 months 12 days
2019 Acquisition Activity, prosthetic and orthotic business | Non-compete agreements
Aggregate purchase price of this acquisition was allocated on a preliminary basis
Other intangible assets, net			$ 350						$ 350
Weighted average useful life									4 years 10 months 24 days