Derivative Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets	$ 59,242	$ 113,540
Derivative Asset	18,362	$ 100,955
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets	$ 4,300
Number of derivative counterparties | Customer	4
Derivative, Notional Amount	$ 300,000
Derivative, Average Fixed Interest Rate	136.00%
Commodity contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets	$ 36,500
Number of derivative counterparties | Customer	7
Commodity contracts | Crude Oil
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	NYMEX WTI
Commodity contracts | MEH [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	MEH
Commodity contracts | Natural Gas [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	NYMEX HH
Commodity contracts | Natural Gas Liquids
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	OPIS Mt Belv Ethane