Archaea Energy Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Narrative (Details)

Derivative Instruments - Narrative (Details) $ / shares in Units, $ in Thousands	8 Months Ended	9 Months Ended		12 Months Ended
	Sep. 14, 2021 USD ($)	Sep. 30, 2021 MMBTU d $ / shares shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) MMBTU	Nov. 30, 2021 $ / shares	Apr. 07, 2021 $ / shares	Apr. 06, 2020 USD ($)
Class of Warrant or Right [Line Items]
Warrant exercise price (in usd per share)						$ 11.50
Notional quantity, natural gas variable to fixed price swap agreement (energy) \| MMBTU		382,800
Sales Price Of Class A Common Stock, Equal Or Exceeds $10.00 Per Share
Class of Warrant or Right [Line Items]
Stock price (in usd per share)		$ 10.00
Threshold consecutive trading day period \| d		30
Sales Price Of Class A Common Stock, Equal Or Exceeds $18.00 Per Share
Class of Warrant or Right [Line Items]
Redemption price of outstanding warrants (in usd per share)		$ 0.01
Threshold trading days \| d		20
Natural Gas Swap \| Aria Energy LLC
Class of Warrant or Right [Line Items]
Notional quantity, natural gas variable to fixed price swap agreement (energy) \| MMBTU				789,600
Derivative instrument, cash payments \| $	$ 500		$ 1,100
Interest Rate Cap \| Aria Energy LLC
Class of Warrant or Right [Line Items]
Derivative, notional amount \| $							$ 110,000
Derivative, fixed interest rate (in percentage)		1.00%
Debt instrument, collateral fee \| $	$ 0			$ 0
Class A Units
Class of Warrant or Right [Line Items]
Warrant exercise price (in usd per share)						$ 11.50
Class A Units \| Sales Price Of Class A Common Stock, Equal Or Exceeds $18.00 Per Share
Class of Warrant or Right [Line Items]
Stock price (in usd per share)		$ 18.00
Redeemable Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares) \| shares		12,112,492
Warrant exercise price (in usd per share)		$ 11.50
Redeemable Warrants \| Forecast \| Sales Price Of Class A Common Stock, Equal Or Exceeds $10.00 Per Share
Class of Warrant or Right [Line Items]
Redemption price of outstanding warrants (in usd per share)					$ 0.10
Public Warrant \| Class A Units
Class of Warrant or Right [Line Items]
Redeemable warrants exchange ratio		0.361
Private Placement
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares) \| shares		6,771,000
Warrants transferred \| shares		0
Private Placement \| Class A Units
Class of Warrant or Right [Line Items]
Conversion of warrants to common stock (in shares) \| shares		1