Assets Held for Sale and Discontinued Operations - Summary of Results of Operations for Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Discontinued Operations And Disposal Groups [Abstract]
Revenues					$ 7,160
Depreciation, depletion, amortization and accretion					(550)
Other operating expenses					(5,296)
Other income					2
Income from discontinued operations, net of tax					1,316
Income from discontinued operations, net of tax	$ 30	$ (1,237)	$ 2,705	$ (182)	$ 1,316