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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.

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