Basis of consolidation and presentation line Items.

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- Definition

Reimbursement of workers compensation insurance claims included in other current assets.

+ References

No definition available.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Basis Of Consolidation And Presentation [Line Items]
Reimbursement of workers compensation insurance claims included in other current assets	$ 39,000	$ 35,600
Impairment expense related to oil and natural gas properties	2,200	1,000	$ 4,300
Right of use asset	31,275
Operating lease liabilities	36,579
Adjustment of loss before income tax	(530,378)	$ (367,408)	$ (327,801)
Contract Drilling
Basis Of Consolidation And Presentation [Line Items]
Adjustment of loss before income tax	$ (6,600)
Accounting Standards Update 2016-02
Basis Of Consolidation And Presentation [Line Items]
Right of use asset				$ 31,000
Operating lease liabilities				$ 35,800