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Chapter 11 Proceedings and Emergence - Additional Information (Detail)		1 Months Ended	6 Months Ended
	Jul. 31, 2017 USD ($) Vessel $ / shares shares	Jul. 31, 2017 USD ($) Vessel $ / shares shares	Sep. 30, 2017 USD ($) Claim shares	Aug. 01, 2017
Reorganizations [Line Items]
Number of vessels leased | Vessel	16	16
Claims paid in cash	$ 225,000,000	$ 225,000,000
Percentage of common equity	95.00%	95.00%
Debt instrument fixed interest rate	8.00%	8.00%
Aggregate principal amount	$ 350,000,000	$ 350,000,000
Bankruptcy claims, percentage of common equity issued to existing stockholders		5.00%
Purchase warrant exercise period			6 years
Warrants issued | shares			410,262
Plan of Reorganization
Reorganizations [Line Items]
Number of claims settled | Claim			5
Claims settled aggregate amount			$ 166,100,000
Number of claims reserved | Claim			1
Claims reserved amount remained outstanding			$ 94,100,000
Plan of Reorganization | Predecessor
Reorganizations [Line Items]
Liabilities subject to compromise, sale leaseback parties	$ 260,200,000	$ 260,200,000
Series A Warrants
Reorganizations [Line Items]
Warrants issued | shares	2,400,000	2,400,000
Nominal exercise price of warrants | $ / shares	$ 57.06	$ 57.06
Series B Warrants
Reorganizations [Line Items]
Warrants issued | shares	2,600,000	2,600,000
Nominal exercise price of warrants | $ / shares	$ 62.28	$ 62.28
Minimum | Non-U.S. Citizens
Reorganizations [Line Items]
Ownership percentage of common stock	24.00%	24.00%
Minimum | Non-U.S. Citizens | New Creditor Warrant
Reorganizations [Line Items]
Ownership percentage of common stock				22.00%
Maximum | Plan of Reorganization
Reorganizations [Line Items]
Claims reserved amount remained outstanding			$ 94,100,000
Maximum | Non-U.S. Citizens
Reorganizations [Line Items]
Ownership percentage of common stock	25.00%	25.00%
New Secured Notes
Reorganizations [Line Items]
Debt instrument fixed interest rate	8.00%	8.00%
Debt instrument maturity date		Dec. 30, 2022
Aggregate principal amount	$ 350,000,000	$ 350,000,000
New Secured Notes | Plan of Reorganization
Reorganizations [Line Items]
Debt instrument maturity date	Aug. 01, 2022

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