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RELATED PARTY TRANSACTIONS (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / Mcf	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Accounts receivable from affiliates	$ 9,263		$ 9,263		$ 6,155
Partnerships owned by majority stockholder
Related Party Transaction [Line Items]
Related party revenue, fee (in USD per Mcf) | $ / Mcf			0.02
Accounts receivable from affiliates	9,300		$ 9,300
Related party asset	25,500		25,500
Partnerships owned by majority stockholder | Partnership costs to drill and operating wells and overhead fees
Related Party Transaction [Line Items]
Revenue from related parties	$ 353	$ 54	$ 1,200	$ 433

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