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Sale/ Leaseback Arrangements - Additional Information (Detail)
 1 Months Ended 4 Months Ended 6 Months Ended
May 31, 2017
Vessel
Jul. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Claim
Sale Leaseback Transaction [Line Items]      
Costs incurred to leased vessels, description     Costs incurred subsequent to the Petition Date to mobilize those vessels and prepare them for re-delivery to the lessors has been included in reorganization items for the period August 1, 2017 through September 30, 2017 (Successor)
Date of petition for bankruptcy     May 17, 2017
Unamortized deferred gains credited to reorganization items on account of lease rejections     $ 105,900,000
Predecessor      
Sale Leaseback Transaction [Line Items]      
Deferred gains on sale/leaseback transactions   $ 3,000,000  
Plan of Reorganization      
Sale Leaseback Transaction [Line Items]      
Number of vessels rejected pursuant to court order | Vessel 16    
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
Number of vessels operating throughout the world | Vessel 6    
Plan of Reorganization | Maximum      
Sale Leaseback Transaction [Line Items]      
Claims reserved amount remained outstanding     $ 94,100,000
Plan of Reorganization | Predecessor      
Sale Leaseback Transaction [Line Items]      
Included in liabilities subject to compromise related to claims of sale leaseback parties   $ 260,200,000