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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jul. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
Vessel
Segment Reporting Information [Line Items]            
Other operating revenues   $ 74,300 $ 99,192   $ 296,286  
Number of ROVs disposed | Vessel           8
General and administrative expenses   16,246 25,546   73,536  
Corporate            
Segment Reporting Information [Line Items]            
General and administrative expenses   4,797 [1],[2] 9,415 [2]   23,909 [1]  
GulfMark | Corporate            
Segment Reporting Information [Line Items]            
General and administrative expenses     3,200   4,700  
Predecessor            
Segment Reporting Information [Line Items]            
Other operating revenues $ 36,263     $ 312,118    
General and administrative expenses 8,773     83,559    
Corporate general and administrative expenses       23,400    
Predecessor | Corporate            
Segment Reporting Information [Line Items]            
General and administrative expenses 2,840 [2]     39,299 [1]    
Other Operating Revenues            
Segment Reporting Information [Line Items]            
Other operating revenues   3,729 [3],[4] $ 2,181 [4]   $ 7,607 [3]  
Other Operating Revenues | Subsea Business            
Segment Reporting Information [Line Items]            
Other operating revenues   $ 1,600        
Other Operating Revenues | Predecessor            
Segment Reporting Information [Line Items]            
Other operating revenues 1,923 [4]     8,617 [3]    
Other Operating Revenues | Predecessor | Subsea Business            
Segment Reporting Information [Line Items]            
Other operating revenues $ 400     $ 1,100    
[1] Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are restructuring-related professional services costs of $23.4 million. Included in corporate general and administrative expenses for the nine month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $4.7 million.
[2] Included in corporate general and administrative expenses for the three month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $3.2 million.
[3] Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 million, respectively  of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.
[4] Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 million, respectively of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.