Acquisitions - Net Assets Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 2,724,958	$ 3,545,297	$ 3,512,567
Significant Acquisitions In 2023
Business Acquisition [Line Items]
Cash	256
Accounts receivable	1,264
Inventory	1,483
Prepaid and other current assets	10
Equipment and other fixed assets	9,011
Operating lease right-of-use assets	5,506
Finance lease right-of-use assets	200
Goodwill	9,616
Accounts payable and accrued expenses	(713)
Other current liabilities	(847)
Operating lease liabilities	(5,506)
Finance lease liabilities	(200)
Net assets acquired	$ 20,080
Significant Acquisitions In 2022
Business Acquisition [Line Items]
Cash		162
Accounts receivable		2,336
Inventory		771
Prepaid and other current assets		16
Equipment and other fixed assets		4,585
Goodwill		12,341
Identifiable intangible assets		500
Deferred tax assets		180
Accounts payable and accrued expenses		(3,130)
Contract liabilities		(134)
Net assets acquired		$ 17,627
Significant Acquisitions In 2021
Business Acquisition [Line Items]
Cash			36,993
Accounts receivable			126,902
Inventory			50,352
Prepaid and other current assets			7,736
Equipment and other fixed assets			274,357
Operating lease right-of-use assets			78,643
Goodwill			2,536,566
Identifiable intangible assets			132,900
Other assets			3,699
Deferred tax liabilities			(47,770)
Accounts payable and accrued expenses			(131,583)
Contract liabilities			(19,630)
Other current liabilities			(13,701)
Other long-term liabilities			(3,738)
Operating lease liabilities			(78,643)
Finance lease liabilities			(11,635)
Net assets acquired			2,941,448
AeroCare
Business Acquisition [Line Items]
Cash			27,686
Accounts receivable			71,916
Inventory			26,998
Prepaid and other current assets			3,522
Equipment and other fixed assets			190,755
Operating lease right-of-use assets			52,927
Goodwill			2,083,423
Identifiable intangible assets			122,800
Other assets			1,178
Deferred tax liabilities			(46,234)
Accounts payable and accrued expenses			(82,722)
Contract liabilities			(14,495)
Other current liabilities			(10,021)
Other long-term liabilities			(1,055)
Operating lease liabilities			(52,927)
Finance lease liabilities			0
Net assets acquired			2,373,751
Spiro
Business Acquisition [Line Items]
Cash			2,132
Accounts receivable			5,756
Inventory			1,733
Prepaid and other current assets			152
Equipment and other fixed assets			6,897
Operating lease right-of-use assets			2,581
Goodwill			64,380
Identifiable intangible assets			1,000
Other assets			16
Deferred tax liabilities			0
Accounts payable and accrued expenses			(5,517)
Contract liabilities			(486)
Other current liabilities			0
Other long-term liabilities			0
Operating lease liabilities			(2,581)
Finance lease liabilities			(2,195)
Net assets acquired			73,868
Healthy Living
Business Acquisition [Line Items]
Cash			579
Accounts receivable			5,838
Inventory			2,949
Prepaid and other current assets			1,088
Equipment and other fixed assets			1,188
Operating lease right-of-use assets			1,366
Goodwill			44,095
Identifiable intangible assets			1,500
Other assets			0
Deferred tax liabilities			0
Accounts payable and accrued expenses			(3,363)
Contract liabilities			(102)
Other current liabilities			(1,667)
Other long-term liabilities			0
Operating lease liabilities			(1,366)
Finance lease liabilities			0
Net assets acquired			52,105
Agilis
Business Acquisition [Line Items]
Cash			1,131
Accounts receivable			0
Inventory			2,330
Prepaid and other current assets			0
Equipment and other fixed assets			348
Operating lease right-of-use assets			490
Goodwill			55,375
Identifiable intangible assets			500
Other assets			0
Deferred tax liabilities			0
Accounts payable and accrued expenses			(3,188)
Contract liabilities			0
Other current liabilities			0
Other long-term liabilities			0
Operating lease liabilities			(490)
Finance lease liabilities			0
Net assets acquired			56,496
We Care
Business Acquisition [Line Items]
Cash			458
Accounts receivable			2,007
Inventory			465
Prepaid and other current assets			0
Equipment and other fixed assets			5,254
Operating lease right-of-use assets			970
Goodwill			35,971
Identifiable intangible assets			400
Other assets			0
Deferred tax liabilities			(1,228)
Accounts payable and accrued expenses			(1,389)
Contract liabilities			(783)
Other current liabilities			0
Other long-term liabilities			0
Operating lease liabilities			(970)
Finance lease liabilities			0
Net assets acquired			41,155
Community
Business Acquisition [Line Items]
Cash			2
Accounts receivable			15,798
Inventory			5,214
Prepaid and other current assets			571
Equipment and other fixed assets			44,952
Operating lease right-of-use assets			4,412
Goodwill			88,393
Identifiable intangible assets			2,300
Other assets			2,505
Deferred tax liabilities			0
Accounts payable and accrued expenses			(13,725)
Contract liabilities			(3,156)
Other current liabilities			(180)
Other long-term liabilities			(2,683)
Operating lease liabilities			(4,412)
Finance lease liabilities			(4,768)
Net assets acquired			135,223
Other
Business Acquisition [Line Items]
Cash			5,005
Accounts receivable			25,587
Inventory			10,663
Prepaid and other current assets			2,403
Equipment and other fixed assets			24,963
Operating lease right-of-use assets			15,897
Goodwill			164,929
Identifiable intangible assets			4,400
Other assets			0
Deferred tax liabilities			(308)
Accounts payable and accrued expenses			(21,679)
Contract liabilities			(608)
Other current liabilities			(1,833)
Other long-term liabilities			0
Operating lease liabilities			(15,897)
Finance lease liabilities			(4,672)
Net assets acquired			$ 208,850