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Selected Financial Information (Parenthetical) (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Quarterly Financial Data [Line Items]                        
Revenues   $ 74,300 $ 104,453             $ 178,753    
Asset impairments     $ 16,777             $ 16,777 [1]    
Predecessor                        
Quarterly Financial Data [Line Items]                        
Revenues $ 36,263     $ 115,106 $ 160,749 [2] $ 129,215 [2] $ 143,722 [2] $ 167,925 [2] $ 151,369   $ 440,862 $ 601,611
Asset impairments $ 21,325     $ 163,423 64,857 $ 253,422 $ 129,562 $ 36,886 $ 184,748 [1]     $ 484,727 [1]
Early Cancellation of Long-Term Vessel Charter Contract | Predecessor                        
Quarterly Financial Data [Line Items]                        
Revenues         $ 39,100              
[1] The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.
[2] Included in revenues for the quarter ended March 31, 2017 is $39.1 million of revenue related to early cancellation of a long-term vessel charter contract