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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Total revenues $ 119,765 $ 99,192 $ 367,772 $ 296,286
Operating profit (loss) [1] 1,477 2,852 14,108 9,356
Corporate expenses [1],[2] (19,074) (9,514) (46,496) (24,208)
Gain (loss) on asset dispositions, net 270 (1,571) 1,047 1,686
Asset impairments [3] (5,224) (16,853) (5,224) (24,254)
Operating loss (22,551) (25,086) (36,565) (37,420)
Depreciation and amortization 25,735 13,390 73,705 38,192
Additions to properties and equipment 5,083 3,341 13,931 9,116
All Other Segments        
Segment Reporting Information [Line Items]        
Operating profit (loss) [1] 2,052 485 5,381 2,767
Depreciation and amortization 5 5 15 16
Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Operating profit (loss) [1] (168) 1,212 1,702 11,804
Depreciation and amortization 6,929 3,858 19,706 10,700
Additions to properties and equipment 326 564 967 2,831
Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Operating profit (loss) [1] (809) (701) (4,098) (2,329)
Depreciation and amortization 5,685 2,939 15,454 8,552
Additions to properties and equipment 594 568 4,231 2,064
Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Operating profit (loss) [1] (276) (2,056) (768) (6,753)
Depreciation and amortization 7,436 2,313 22,623 6,356
Additions to properties and equipment 1,847   3,070 134
Operating Segments | West Africa Segment        
Segment Reporting Information [Line Items]        
Operating profit (loss) [1] 678 3,912 11,891 3,867
Depreciation and amortization 5,335 4,176 14,876 12,269
Additions to properties and equipment 684 54 2,267 35
Corporate        
Segment Reporting Information [Line Items]        
Depreciation and amortization 345 99 1,031 299
Additions to properties and equipment 1,632 2,155 3,396 4,052
Service | Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Total revenues 33,147 28,039 103,624 86,721
Service | Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 22,765 19,927 63,670 60,721
Service | Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Total revenues 30,946 12,566 94,531 35,546
Service | Operating Segments | West Africa Segment        
Segment Reporting Information [Line Items]        
Total revenues 30,315 36,479 98,651 105,691
Other Operating Revenues        
Segment Reporting Information [Line Items]        
Total revenues $ 2,592 $ 2,181 $ 7,296 $ 7,607
[1] Prior to January 1, 2019, we allocated the costs of certain marine operations related to general and administrative functions, such as marine management, engineering, supply chain management, risk management, fleet human resources and health and safety to the segment general and administrative expenses.  Beginning on January 1, 2019 our management elected to modify that process in order to better analyze costs and better align the policies of the two combined companies such that all costs related to those previously allocated functions will remain as corporate general and administrative expenses. This change explains the significant increase in corporate expenses that is reflected in the table above for the three and nine months ended September 30, 2019.   
[2] Included in corporate expenses for the nine months ended September 30, 2019 was a $5.0 million charge for  integration costs related to the business combination with GulfMark. 
[3] Refer to Note (14) for additional information regarding asset impairment charges.