Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	Apr. 29, 2017	Aug. 31, 2016	Apr. 19, 2016	Sep. 30, 2017	Sep. 30, 2017	Oct. 12, 2017	Oct. 06, 2017	Apr. 14, 2017
Loss Contingencies [Line Items]
Claims settled				$ 399,000	$ 399,000
Make-whole fees included in reorganization items				223,838	223,838
Bankruptcy claims, amount of claims settled included in interest expense				175,200	175,200
Accrued Liabilities
Loss Contingencies [Line Items]
Make-whole fees included in reorganization items				223,800	223,800
Interest Payable
Loss Contingencies [Line Items]
Claims settled				$ 175,200	$ 175,200
Subsequent Event
Loss Contingencies [Line Items]
Bankruptcy claims, amount paid to settle claims						$ 400,300
Bankruptcy claims, undistributed amount returned							$ 1,300
Indebtedness Claims | Notes holders
Loss Contingencies [Line Items]
Claim reserve account after effective date								$ 400,000
Royalties | ONRR
Loss Contingencies [Line Items]
Bankruptcy claims amount			$ 35,100
Oil Sales Contract | SPMT
Loss Contingencies [Line Items]
Bankruptcy claims amount		$ 16,900
Damage sought value	$ 38,600