Fresh Start Accounting - Schedule of Net Increase in Stockholders'/Partners' Equity (Detail) - USD ($) $ in Thousands		4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017	May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Fresh Start Adjustment [Line Items]
Recognition on gain on settlement of liabilities subject to compromise			$ 0	$ 0	$ 0
Par value of common stock		$ (377,645)
Par value of common stock	$ 3	3		$ 209	$ 3
Predecessor [Member]
Fresh Start Adjustment [Line Items]
Recognition on gain on settlement of liabilities subject to compromise		758,764
Reorganization Adjustments [Member]
Fresh Start Adjustment [Line Items]
Issuance of common stock	377,645
Recognition on gain on settlement of liabilities subject to compromise	758,764
Recognition of contribution from management	1,500
Par value of common stock	(3)
Change in Successor additional paid-in capital	1,212,469	1,212,469
Par value of common stock	3	3
Net increase in capital accounts	1,136,659
Reorganization Adjustments [Member] | Predecessor [Member]
Fresh Start Adjustment [Line Items]
Issuance of common stock	7,707
Cancellation of the Predecessor's units issued and outstanding	80,601
Recognition of issuance of common stock to Predecessor common unitholders	(7,707)
Recognition of issuance of warrants to Predecessor common unitholders	(4,788)
Recognition of settlement with Predecessor common unitholders	(1,250)
Issuance of warrants to Predecessor common unitholders	4,788
Predecessor units issued and outstanding	$ (80,601)	$ (80,601)