SEGMENTS (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of operating segments | Segment		2
Segment Reporting Information [Line Items]
Net income including noncontrolling interests	[1]	$ 21,389	$ 18,136
Gain on redemption of mandatorily redeemable Preferred Units	[1]	4,493	0
Income tax expense (benefit)	[1]	676	0
Depreciation and amortization expense	[1]	61,023	55,971
Share-based compensation		6,132	0
Loss on disposal of assets	[1]	110	32
Loss on debt extinguishment		129	(239)
Derivatives settlement	[1]	2,886	0
Interest and other income	[1]	250	537
Equity in (earnings) losses from unconsolidated affiliate	[1]	(27,917)	(11,355)
Assets		6,013,657		$ 3,553,206
Product and Service
Segment Reporting Information [Line Items]
Revenue from contract with customer		255,373	147,655
Operating Segments
Segment Reporting Information [Line Items]
Assets		6,007,946		3,552,558
Operating Segments | Midstream Logistics
Segment Reporting Information [Line Items]
Net income including noncontrolling interests		9,185	8,194
Interest expense (income)		26,642	27,694
Gain on redemption of mandatorily redeemable Preferred Units		0
Income tax expense (benefit)		457
Depreciation and amortization expense		60,893	55,842
Contract assets amortization		448	448
Proportionate EMI EBITDA		0	0
Share-based compensation		0
Loss on disposal of assets		110	32
Loss on debt extinguishment		129	(239)
Derivatives settlement		0	(13,456)
Integration costs		4,104
Acquisition transaction costs		4
Other one-time costs or amortization		918	389
Interest and other income			16
Equity in (earnings) losses from unconsolidated affiliate		0	0
Segment adjusted EBITDA		102,890	105,800
Revenue from contract with customer		257,247	148,101
Assets		3,624,556		2,916,774
Operating Segments | Midstream Logistics | Product and Service
Segment Reporting Information [Line Items]
Revenue from contract with customer		255,373	147,655
Operating Segments | Midstream Logistics | Other
Segment Reporting Information [Line Items]
Revenue from contract with customer		1,874	446
Operating Segments | Pipeline Transportation
Segment Reporting Information [Line Items]
Net income including noncontrolling interests		29,136	12,429
Interest expense (income)		(1,614)	(2,145)
Gain on redemption of mandatorily redeemable Preferred Units		0
Income tax expense (benefit)		(39)
Depreciation and amortization expense		130	129
Contract assets amortization		0	0
Proportionate EMI EBITDA		40,741	16,256
Share-based compensation		0
Loss on disposal of assets		0	0
Loss on debt extinguishment		0	0
Derivatives settlement		0	0
Integration costs		0
Acquisition transaction costs		0
Other one-time costs or amortization		0	8
Interest and other income			0
Equity in (earnings) losses from unconsolidated affiliate		27,917	11,355
Segment adjusted EBITDA		40,437	15,322
Revenue from contract with customer		2	2
Assets		2,383,390		635,784
Operating Segments | Pipeline Transportation | Product and Service
Segment Reporting Information [Line Items]
Revenue from contract with customer		0	0
Operating Segments | Pipeline Transportation | Other
Segment Reporting Information [Line Items]
Revenue from contract with customer		2	2
Corporate and Other
Segment Reporting Information [Line Items]
Net income including noncontrolling interests		(16,932)	(2,487)
Interest expense (income)		1,617	0
Gain on redemption of mandatorily redeemable Preferred Units		(4,493)
Income tax expense (benefit)		258
Depreciation and amortization expense		0	0
Contract assets amortization		0	0
Proportionate EMI EBITDA		0	0
Share-based compensation		6,132
Loss on disposal of assets		0	0
Loss on debt extinguishment		0	0
Derivatives settlement		2,886	0
Integration costs		2,047
Acquisition transaction costs		5,672
Other one-time costs or amortization		277	(69)
Interest and other income			0
Equity in (earnings) losses from unconsolidated affiliate		0	0
Segment adjusted EBITDA		(2,536)	(2,556)
Revenue from contract with customer		0	0
Assets		5,711		$ 648
Corporate and Other | Product and Service
Segment Reporting Information [Line Items]
Revenue from contract with customer		0	0
Corporate and Other | Other
Segment Reporting Information [Line Items]
Revenue from contract with customer		0	0
Consolidated
Segment Reporting Information [Line Items]
Net income including noncontrolling interests		21,389	18,136
Interest expense (income)		26,645	25,549
Gain on redemption of mandatorily redeemable Preferred Units		(4,493)
Income tax expense (benefit)		676
Depreciation and amortization expense		61,023	55,971
Contract assets amortization		448	448
Proportionate EMI EBITDA		40,741	16,256
Share-based compensation		6,132
Loss on disposal of assets		110	32
Loss on debt extinguishment		129	(239)
Derivatives settlement		2,886	(13,456)
Integration costs		6,151
Acquisition transaction costs		5,676
Other one-time costs or amortization		1,195	328
Interest and other income			16
Equity in (earnings) losses from unconsolidated affiliate		27,917	11,355
Segment adjusted EBITDA		140,791	118,566
Revenue from contract with customer		257,249	148,103
Consolidated | Other
Segment Reporting Information [Line Items]
Revenue from contract with customer		$ 1,876	$ 448

[1] The results of the legacy ALTM business are not included in the Company’s consolidated financials prior to February 22, 2022. Refer to the Form 10-Q basis of presentation in Note 1—Description of the Organization and Summary of Significant Accounting Policies, for further information on the Company’s basis of presentation.