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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Allowance for doubtful accounts	$ 0	$ 0
Unbilled receivables	80,100,000	79,000,000
Rebate receivable	43,000,000	35,200,000
Investments in equity-method investees	20,100,000	17,000,000
Proportionate share of earnings in equity-method investees	6,030,000	3,313,000	$ 2,840,000
Capital distribution from equity method investments	$ 2,900,000	$ 3,250,000	$ 500,000
Revenue from Contract with Customer Benchmark \| Customer Concentration Risk \| Largest Payer
Concentration Risk [Line Items]
Concentration risk	16.00%	15.00%	16.00%
Revenue from Contract with Customer Benchmark \| Governmental Programs \| Government Healthcare Programs
Concentration Risk [Line Items]
Concentration risk	12.00%	12.00%	12.00%
Accounts Receivable \| Customer Concentration Risk \| Government Healthcare Programs
Concentration Risk [Line Items]
Concentration risk	11.00%	13.00%
Cost of Goods and Service, Product and Service Benchmark \| Medical Supply Vendors \| Four Vendors
Concentration Risk [Line Items]
Concentration risk	74.00%
Cost of Goods and Service, Product and Service Benchmark \| Medical Supply Vendors \| Three Vendors
Concentration Risk [Line Items]
Concentration risk		70.00%	70.00%
Infusion pumps
Concentration Risk [Line Items]
Intangible asset useful life (in years)	7 years
Computer Software
Concentration Risk [Line Items]
Intangible asset useful life (in years)	5 years
Minimum \| Referral sources
Concentration Risk [Line Items]
Intangible asset useful life (in years)	15 years
Minimum \| Trademarks and Trade Names
Concentration Risk [Line Items]
Intangible asset useful life (in years)	2 years
Minimum \| Other amortizable intangible assets
Concentration Risk [Line Items]
Intangible asset useful life (in years)	2 years
Minimum \| Equipment
Concentration Risk [Line Items]
Intangible asset useful life (in years)	3 years
Maximum \| Referral sources
Concentration Risk [Line Items]
Intangible asset useful life (in years)	20 years
Maximum \| Trademarks and Trade Names
Concentration Risk [Line Items]
Intangible asset useful life (in years)	15 years
Maximum \| Other amortizable intangible assets
Concentration Risk [Line Items]
Intangible asset useful life (in years)	9 years
Maximum \| Equipment
Concentration Risk [Line Items]
Intangible asset useful life (in years)	13 years