RESTATEMENT OF PREVIOUSLY ISSUED QUARTERLY FINANCIAL STATEMENTS (UNAUDITED) - Unaudited Condensed Combined/Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net income	$ (31,876)	$ 34,819	$ 2,943	$ 55,344	$ 112,882	$ 150,496
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		8,116	17,370	40,809	25,632	22,311
Amortization and write-off of deferred financing fees		775	1,551	3,115	6,068	1,205
Stock-based compensation			90,936	115,544	0	0
Loss on disposition of property and equipment		343	343
Loss on investment in partnership		(120)	4,288	4,565	391	346
Gain on other investments			(476)	(1,258)	0	0
Deferred taxes		3,950	(34,653)	(44,484)	(9,923)	(1,921)
Noncash lease expense		6,863	14,603	34,647	22,727	14,464
Change in operating assets and liabilities
Accounts receivable, net		(63,992)	(32,330)	(93,968)	(176,883)	(114,416)
Other receivables		(13,755)	1,863	(22,487)	(3,059)	(202)
Prepaid expenses and other current assets		(5,009)	(11,747)	(17,210)	(18,765)	(6,371)
Other assets		(1,802)	(1,021)	(13,338)	(3,338)	(39,341)
Escrow funds		(5,807)	(3,882)	(9,473)	568	(4,526)
Operating lease liabilities		(8,234)	(10,194)	(20,784)	(2,011)	(92)
Accounts payable		13,938	(17,203)	33,398	33,371	32,808
Accrued payroll and benefits		51,577	7,137	52,041	6,325	(5,564)
Accrued self-insurance liabilities		10,399	29,660	67,242	35,576	67,636
Refund liability		3,947	30,586	145,795	0	0
Other accrued expenses		1,304	5,480	73,210	(55,501)	(24,390)
Other liabilities		21,439	(1,731)	(36,210)	89,056	168
NET CASH PROVIDED BY OPERATING ACTIVITIES		58,751	93,523	367,341	63,697	92,615
Cash flows from investing activities
Investment in partnerships		(5,081)	(5,081)	(32,891)	(2,597)	0
Non-operating distributions from investment in partnership		673	1,190	3,521	1,862	2,905
Purchase of investments		(25,000)	(35,000)	(90,874)	0	0
Acquisition of facilities		(78,500)	(174,650)	(283,344)	(127,024)	(55,374)
Purchase of property and equipment		(10,761)	(26,093)	(66,465)	(45,782)	(22,862)
Proceeds from the sale of assets			0	1,500	750	10
NET CASH USED IN INVESTING ACTIVITIES		(118,669)	(239,634)	(442,679)	(172,791)	(75,321)
Cash flows from financing activities
Borrowing on lines of credit, net of deferred financing fees		117,000	288,000	676,000	855,704	154,528
Payments on lines of credit		(100,000)	(560,000)	(1,054,000)	(497,986)	(119,149)
Dividends on common stock		(17,474)	(33,721)	(33,721)	(80,394)	(60,280)
Contributions from noncontrolling interest			502	502	587	3,246
Borrowings of long-term debt, net of deferred financing fees		39,786	39,757
Payments on long-term debt		(4,823)	(9,836)	(19,455)	(559,632)	(53,901)
Proceeds from initial public offering, net of issuance costs			414,157	414,157	0	0
Taxes paid related to net share settlement of stock-based compensation awards			(33,598)	(33,597)	0	0
NET CASH PROVIDED BY FINANCING ACTIVITIES		34,489	105,261	117,476	129,592	12,350
Net change in cash		(25,429)	(40,850)	42,138	20,498	29,644
Cash, cash equivalents, and restricted cash - beginning of year	93,275	118,704	118,704	118,704	98,206	68,562
Cash, cash equivalents, and restricted cash - end of year	77,854	93,275	77,854	160,842	118,704	98,206
Supplemental disclosures of cash flow information
Interest		16,343	26,983	48,248	50,558	25,911
Income taxes		0	43,455	107,831	60,009	42,554
Non-cash financing and investing activity
Accrued capital expenditures		4,112	5,154	3,716	3,000	$ 717
Assets acquired in operation expansions in exchange for notes payable
Non-cash financing and investing activity
Assets acquired in operation expansions		0	0
Assets acquired in operation expansions through settlement of notes receivable
Non-cash financing and investing activity
Assets acquired in operation expansions		500	500
As Previously Reported
Cash flows from operating activities
Net income	(10,908)	49,140	38,232
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		7,902	16,678
Amortization and write-off of deferred financing fees		775	1,551
Stock-based compensation			90,936
Loss on disposition of property and equipment		343	343
Loss on investment in partnership		(120)	4,288
Gain on other investments			(476)
Deferred taxes		4,985	(15,969)
Noncash lease expense		7,262	15,185
Change in operating assets and liabilities
Accounts receivable, net		(74,930)	(62,770)
Other receivables		(13,755)	1,863
Prepaid expenses and other current assets		(5,009)	(18,286)
Other assets		(1,802)	(1,021)
Escrow funds		(5,807)	(3,882)
Operating lease liabilities		(8,572)	(9,859)
Accounts payable		13,938	(17,203)
Accrued payroll and benefits		51,577	14,843
Accrued self-insurance liabilities		10,399	29,660
Refund liability		0	0
Other accrued expenses		1,340	5,492
Other liabilities		21,121	3,995
NET CASH PROVIDED BY OPERATING ACTIVITIES		58,787	93,600
Cash flows from investing activities
Investment in partnerships		(5,081)	(5,081)
Non-operating distributions from investment in partnership		673	1,190
Purchase of investments		(25,000)	(35,000)
Acquisition of facilities		(78,500)	(174,650)
Purchase of property and equipment		(10,761)	(26,093)
Proceeds from the sale of assets			0
NET CASH USED IN INVESTING ACTIVITIES		(118,669)	(239,634)
Cash flows from financing activities
Borrowing on lines of credit, net of deferred financing fees		117,000	288,000
Payments on lines of credit		(100,000)	(560,000)
Dividends on common stock		(17,474)	(33,721)
Contributions from noncontrolling interest			502
Borrowings of long-term debt, net of deferred financing fees		39,786	39,757
Payments on long-term debt		(4,859)	(9,913)
Proceeds from initial public offering, net of issuance costs			414,157
Taxes paid related to net share settlement of stock-based compensation awards			(33,598)
NET CASH PROVIDED BY FINANCING ACTIVITIES		34,453	105,184
Net change in cash		(25,429)	(40,850)
Cash, cash equivalents, and restricted cash - beginning of year	93,275	118,704	118,704	118,704
Cash, cash equivalents, and restricted cash - end of year	77,854	93,275	77,854		118,704
Supplemental disclosures of cash flow information
Interest		15,638	25,550
Income taxes		0	43,455
Non-cash financing and investing activity
Accrued capital expenditures		4,112	5,154
As Previously Reported | Assets acquired in operation expansions in exchange for notes payable
Non-cash financing and investing activity
Assets acquired in operation expansions		0	0
As Previously Reported | Assets acquired in operation expansions through settlement of notes receivable
Non-cash financing and investing activity
Assets acquired in operation expansions		500	500
Restatement Adjustments
Cash flows from operating activities
Net income	(20,968)	(14,321)	(35,289)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		214	692
Amortization and write-off of deferred financing fees		0	0
Stock-based compensation			0
Loss on disposition of property and equipment		0	0
Loss on investment in partnership		0	0
Gain on other investments			0
Deferred taxes		(1,035)	(18,684)
Noncash lease expense		(399)	(582)
Change in operating assets and liabilities
Accounts receivable, net		10,938	30,440
Other receivables		0	0
Prepaid expenses and other current assets		0	6,539
Other assets		0	0
Escrow funds		0	0
Operating lease liabilities		338	(335)
Accounts payable		0	0
Accrued payroll and benefits		0	(7,706)
Accrued self-insurance liabilities		0	0
Refund liability		3,947	30,586
Other accrued expenses		(36)	(12)
Other liabilities		318	(5,726)
NET CASH PROVIDED BY OPERATING ACTIVITIES		(36)	(77)
Cash flows from investing activities
Investment in partnerships		0	0
Non-operating distributions from investment in partnership		0	0
Purchase of investments		0	0
Acquisition of facilities		0	0
Purchase of property and equipment		0	0
Proceeds from the sale of assets			0
NET CASH USED IN INVESTING ACTIVITIES		0	0
Cash flows from financing activities
Borrowing on lines of credit, net of deferred financing fees		0	0
Payments on lines of credit		0	0
Dividends on common stock		0	0
Contributions from noncontrolling interest			0
Borrowings of long-term debt, net of deferred financing fees		0	0
Payments on long-term debt		36	77
Proceeds from initial public offering, net of issuance costs			0
Taxes paid related to net share settlement of stock-based compensation awards			0
NET CASH PROVIDED BY FINANCING ACTIVITIES		36	77
Net change in cash		0	0
Cash, cash equivalents, and restricted cash - beginning of year	0	0	0	$ 0
Cash, cash equivalents, and restricted cash - end of year	$ 0	0	0		$ 0
Supplemental disclosures of cash flow information
Interest		705	1,433
Income taxes		0	0
Non-cash financing and investing activity
Accrued capital expenditures		0	0
Restatement Adjustments | Assets acquired in operation expansions in exchange for notes payable
Non-cash financing and investing activity
Assets acquired in operation expansions		0	0
Restatement Adjustments | Assets acquired in operation expansions through settlement of notes receivable
Non-cash financing and investing activity
Assets acquired in operation expansions		$ 0	$ 0