Fair Value Measurements - Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Liabilities
Common stock warrants	$ (8,206)	$ (5,007)
Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		5,595
Derivative asset, fair value, gross liability		(431)
Derivative asset		5,164
Liabilities
Fair value of derivative liability	(34,306)	(2,053)
Derivative liability, fair value, gross asset	4,595	431
Derivative liability	(29,711)	(1,622)
Cash collateral	19,800	10,900
Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		191
Derivative asset, fair value, gross liability		0
Derivative asset		191
Liabilities
Fair value of derivative liability	(1,427)
Derivative liability, fair value, gross asset	0
Derivative liability	(1,427)
Fair Value, Inputs, Level 1 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		170
Liabilities
Fair value of derivative liability	(10,129)	(870)
Fair Value, Inputs, Level 1 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		0
Liabilities
Fair value of derivative liability	0
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		5,425
Liabilities
Fair value of derivative liability	(1,427)	(261)
Fair Value, Inputs, Level 2 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		191
Liabilities
Fair value of derivative liability	(1,427)
Fair Value, Inputs, Level 3 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		0
Liabilities
Fair value of derivative liability	(22,750)	(922)
Fair Value, Inputs, Level 3 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		0
Liabilities
Fair value of derivative liability	0
Exchange Traded \| Commodity derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	6,670	5,404
Derivative asset, fair value, gross liability	(4,595)	(431)
Derivative asset	2,075	4,973
Liabilities
Fair value of derivative liability	(10,129)	(1,131)
Derivative liability, fair value, gross asset	4,595	431
Derivative liability	(5,534)	(700)
Exchange Traded \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	173	4,085
Derivative liability, fair value, gross asset	0	0
Derivative liability	173	4,085
Exchange Traded \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(14,717)
Derivative liability, fair value, gross asset	0
Derivative liability	(14,717)
Exchange Traded \| Fair Value, Inputs, Level 1 \| Commodity derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	4,595	170
Liabilities
Fair value of derivative liability	(10,129)	(870)
Exchange Traded \| Fair Value, Inputs, Level 1 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Fair Value, Inputs, Level 1 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0
Exchange Traded \| Fair Value, Inputs, Level 2 \| Commodity derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	2,075	5,234
Liabilities
Fair value of derivative liability	0	(261)
Exchange Traded \| Fair Value, Inputs, Level 2 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Fair Value, Inputs, Level 2 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0
Exchange Traded \| Fair Value, Inputs, Level 3 \| Commodity derivatives \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	0
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Fair Value, Inputs, Level 3 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	173	4,085
Exchange Traded \| Fair Value, Inputs, Level 3 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(14,717)
Over the Counter \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	(8,206)	(5,007)
Derivative liability, fair value, gross asset	0	0
Derivative liability	(8,206)	(5,007)
Over the Counter \| Fair Value, Inputs, Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Over the Counter \| Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Over the Counter \| Fair Value, Inputs, Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	$ (8,206)	$ (5,007)

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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