Acquisitions - Consideration and Allocation (Details) - USD ($) $ in Thousands					9 Months Ended
	Jul. 01, 2021	Jun. 01, 2021	Apr. 30, 2021	Feb. 01, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Deferred payments					$ 422	$ 1,162
Estimated fair values of net assets acquired
Goodwill					3,524,999		$ 3,512,567
Receipt of working capital adjustment from prior year acquisitions						700
Significant Acquisitions In 2022
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash					16,477
Deferred payments					422
Total					16,899
Estimated fair values of net assets acquired
Cash					155
Accounts receivable					2,206
Inventory					686
Prepaid and other current assets					16
Equipment and other fixed assets					4,502
Goodwill					11,788
Identifiable intangible assets					500
Accounts payable and accrued expenses					(2,820)
Contract liabilities					(134)
Net assets acquired					16,899
Significant Acquisitions In 2021
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash						1,453,302
Equity						1,261,200
Contingent consideration						2,000
Deferred payments						1,162
Total						2,717,664
Estimated fair values of net assets acquired
Cash						34,699
Accounts receivable						119,168
Inventory						45,684
Prepaid and other current assets						6,394
Equipment and other fixed assets						215,350
Operating lease right-of-use assets						72,872
Goodwill						2,386,151
Identifiable intangible assets						128,400
Other assets						1,194
Deferred tax liabilities						(67,849)
Accounts payable and accrued expenses						(107,410)
Contract liabilities						(14,619)
Other current liabilities						(11,576)
Other long-term liabilities						(1,055)
Capital lease obligations						(6,867)
Operating lease obligations						(72,872)
Net assets acquired						2,727,664
Receipt of working capital adjustment from prior year acquisitions					$ 200
AeroCare Holdings
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash				$ 1,200,000		1,152,768
Equity						1,220,342
Total						2,373,110
Estimated fair values of net assets acquired
Cash						27,686
Accounts receivable						75,916
Inventory						27,612
Prepaid and other current assets						3,522
Equipment and other fixed assets						190,755
Operating lease right-of-use assets						55,132
Goodwill						2,096,850
Identifiable intangible assets						122,800
Other assets						1,178
Deferred tax liabilities						(64,916)
Accounts payable and accrued expenses						(82,722)
Contract liabilities						(14,495)
Other current liabilities						(10,021)
Other long-term liabilities						(1,055)
Operating lease obligations						(55,132)
Net assets acquired						2,373,110
Other acquisitions in 2021
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash						121,710
Equity						7,703
Deferred payments						1,162
Total						130,575
Estimated fair values of net assets acquired
Cash						2,673
Accounts receivable						20,900
Inventory						6,219
Prepaid and other current assets						2,466
Equipment and other fixed assets						13,076
Operating lease right-of-use assets						12,176
Goodwill						102,688
Identifiable intangible assets						2,400
Deferred tax asset						425
Accounts payable and accrued expenses						(13,921)
Contract liabilities						(124)
Other current liabilities						(1,555)
Capital lease obligations						(4,672)
Operating lease obligations						(12,176)
Net assets acquired						130,575
Spiro Health Services
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash			$ 66,100			66,101
Equity						7,109
Contingent consideration						1,000
Total						74,210
Maximum potential contingent consideration			$ 1,000
Estimated fair values of net assets acquired
Cash						2,132
Accounts receivable						8,526
Inventory						4,939
Prepaid and other current assets						152
Equipment and other fixed assets						2,148
Operating lease right-of-use assets						2,738
Goodwill						62,640
Identifiable intangible assets						1,000
Other assets						16
Accounts payable and accrued expenses						(5,148)
Capital lease obligations						(2,195)
Operating lease obligations						(2,738)
Net assets acquired						74,210
Healthy Living Medical Supply, L L C
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash		$ 47,000				47,048
Equity						5,057
Total						52,105
Estimated fair values of net assets acquired
Cash						580
Accounts receivable						7,471
Inventory						2,948
Prepaid and other current assets						254
Equipment and other fixed assets						1,201
Operating lease right-of-use assets						1,366
Goodwill						41,955
Identifiable intangible assets						1,300
Accounts payable and accrued expenses						(3,604)
Operating lease obligations						(1,366)
Net assets acquired						52,105
Agilis Med Holdings, LLC
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash	$ 30,800					30,842
Equity						14,668
Contingent consideration						1,000
Total						46,510
Maximum potential contingent consideration	1,000
Estimated fair values of net assets acquired
Cash						1,170
Inventory						2,478
Operating lease right-of-use assets						490
Goodwill						52,938
Identifiable intangible assets						500
Accounts payable and accrued expenses						(576)
Operating lease obligations						(490)
Net assets acquired						56,510
WeCare Medical, LLC
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Cash	$ 34,800					34,833
Equity						6,321
Total						41,154
Estimated fair values of net assets acquired
Cash						458
Accounts receivable						6,355
Inventory						1,488
Equipment and other fixed assets						8,170
Operating lease right-of-use assets						970
Goodwill						29,080
Identifiable intangible assets						400
Deferred tax liabilities						(3,358)
Accounts payable and accrued expenses						(1,439)
Operating lease obligations						(970)
Net assets acquired						$ 41,154