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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
 [1]
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],[3] $ 129,215 [2],[3] $ 143,722 [2],[3] $ 167,925 [2],[3] $ 151,369   $ 440,862  
Asset impairments $ 21,325     $ 163,423 64,857 $ 253,422 $ 129,562 $ 36,886 $ 184,748 [1]     $ 484,727
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] For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.
[3] Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, restructuring charges, asset impairments, general and administrative expenses and gain on asset dispositions, net, of Tidewater's operations. Asset impairments, net, are as follows: