Property, Plant and Equipment - Summary of Oil and Natural Gas Property Costs Not Being Amortized (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Total unproved properties, not subject to amortization	$ 254,994
United States
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Acquisition	80,799
Exploration	52,470
Mexico
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	121,725
2020
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Total unproved properties, not subject to amortization	88,840
2020 \| United States
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Acquisition	61,315
Exploration	12,714
2020 \| Mexico
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	14,811
2019
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Total unproved properties, not subject to amortization	97,775
2019 \| United States
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Acquisition	3,268
Exploration	32,698
2019 \| Mexico
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	61,809
2018
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Total unproved properties, not subject to amortization	36,339
2018 \| United States
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Acquisition	16,216
Exploration	5,761
2018 \| Mexico
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	14,362
2017 and Prior
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Total unproved properties, not subject to amortization	32,040
2017 and Prior \| United States
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	1,297
2017 and Prior \| Mexico
Capitalized Costs Of Unproved Properties Excluded From Amortization [Line Items]
Exploration	$ 30,743

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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The capitalized costs incurred during the period (excluded from amortization) in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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