XML 152 R143.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Segment Information, Geographical Data and Major Customers (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 | [2] | 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 178,753 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,277 |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,619) |  |  |  |
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,989) |  |  |  |
Gain on asset dispositions, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,616 |  |  |  |
Asset impairments |  |  |  |  | $ (16,777) |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,777) | [1] |  |  |
Operating loss |  |  |  | $ (5,782) | (18,091) | [2] |  |  |  |  |  |  |  |  |  |  |  |  | (23,873) |  |  |  |
Foreign exchange loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (407) |  |  |  |
Equity in net earnings of unconsolidated companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,130 |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,771 |  |  |  |
Reorganization items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,299) |  |  |  |
Interest and other debt costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,009) |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,687) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,337 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,834 |  |  |  |
Assets excluding equity investments | [3] |  |  |  | 1,251,125 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,251,125 |  |  |  |
Investments in and advances to unconsolidated companies |  |  |  |  | 29,216 |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,216 |  |  |  |
Assets except corporate portion |  |  |  |  | 1,280,341 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,280,341 |  |  |  |
Assets |  |  |  |  | 1,746,180 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,746,180 |  |  |  |
All Other Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,614 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 827 |  |  |  |
Assets | [3] |  |  |  | 2,443 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,443 |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (337) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,344 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,935 |  |  |  |
Assets | [3] |  |  |  | 1,248,682 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,248,682 |  |  |  |
Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,599) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,767 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144 |  |  |  |
Assets | [3] |  |  |  | 164,958 |  |  |  |  |  |  |  |  |  |  |  |  |  | 164,958 |  |  |  |
Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 451 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,716 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,596 |  |  |  |
Assets | [3] |  |  |  | 48,268 |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,268 |  |  |  |
Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,497) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,794 |  |  |  |
Assets | [3] |  |  |  | 171,157 |  |  |  |  |  |  |  |  |  |  |  |  |  | 171,157 |  |  |  |
Operating Segments | West Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,308 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,067 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195 |  |  |  |
Assets | [3] |  |  |  | 864,299 |  |  |  |  |  |  |  |  |  |  |  |  |  | 864,299 |  |  |  |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,823) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,899 |  |  |  |
Assets | [5] |  |  |  | $ 465,839 |  |  |  |  |  |  |  |  |  |  |  |  |  | 465,839 |  |  |  |
Vessel Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171,884 |  |  |  |
Vessel Revenues | Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,784 |  |  |  |
Vessel Revenues | Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,845 |  |  |  |
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,895 |  |  |  |
Vessel Revenues | Operating Segments | West Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,360 |  |  |  |
Other Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,869 |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,369 |  |  |  |  | $ 601,611 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44,615) |  |  |  |  | (59,380) |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41,832) |  |  |  |  | (145,879) |
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,246) |  |  |  |  | (57,845) |
Gain on asset dispositions, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,561 |  |  |  |  | 24,099 |
Asset impairments |  | $ (21,325) |  |  |  |  | $ (163,423) |  | $ (64,857) |  | $ (253,422) |  | $ (129,562) |  | $ (36,886) |  | (184,748) | [1] |  |  |  | (484,727) | [1]
Operating loss |  | (38,674) | [2] |  |  |  | $ (205,374) | [2] | (69,340) | [2],[6] | $ (287,034) | [2],[6] | $ (155,344) | [2],[6] | $ (66,135) | [2],[6] | (244,048) |  |  |  | $ (508,513) | (577,853) |
Foreign exchange loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,181) |  |  |  |  | (1,638) |
Equity in net earnings of unconsolidated companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,786 |  |  |  |  | 5,710 |
Interest income and other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,384 |  |  |  |  | 5,193 |
Reorganization items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,396,905) |  |  |  |  |  |
Interest and other debt costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,179) |  |  |  |  | (75,026) |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,648,143) |  |  |  | $ (558,359) | (643,614) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,447 |  |  |  |  | 167,291 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,265 |  |  |  |  | 30,547 |
Assets excluding equity investments | [3] | 3,035,550 |  |  |  |  |  |  | 3,282,098 |  |  |  |  |  |  |  | 3,035,550 |  |  |  |  | 3,282,098 |
Investments in and advances to unconsolidated companies |  | 49,367 |  |  |  |  |  |  | 45,115 |  |  |  |  |  |  |  | 49,367 |  |  |  |  | 45,115 |
Assets except corporate portion |  | 3,084,917 |  |  |  |  |  |  | 3,327,213 |  |  |  |  |  |  |  | 3,084,917 |  |  |  |  | 3,327,213 |
Assets |  | 3,884,669 |  |  |  |  |  |  | 4,190,699 |  |  |  |  |  |  |  | 3,884,669 |  |  |  |  | 4,190,699 |
Predecessor | All Other Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 876 |  |  |  |  | (1,548) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,139 |  |  |  |  | 4,430 |
Assets | [3] | 20,392 |  |  |  |  |  |  | 21,580 |  |  |  |  |  |  |  | 20,392 |  |  |  |  | 21,580 |
Predecessor | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,491) |  |  |  |  | (57,832) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,604 |  |  |  |  | 160,405 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,444 |  |  |  |  | 2,448 |
Assets | [3] | 3,015,158 |  |  |  |  |  |  | 3,260,518 |  |  |  |  |  |  |  | 3,015,158 |  |  |  |  | 3,260,518 |
Predecessor | Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,549) |  |  |  |  | 18,873 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,945 |  |  |  |  | 48,814 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  | 93 |
Assets | [3] | 714,891 |  |  |  |  |  |  | 779,778 |  |  |  |  |  |  |  | 714,891 |  |  |  |  | 779,778 |
Predecessor | Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,434) |  |  |  |  | (25,310) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,967 |  |  |  |  | 40,849 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,042 |  |  |  |  | 1,612 |
Assets | [3] | 424,896 |  |  |  |  |  |  | 583,385 |  |  |  |  |  |  |  | 424,896 |  |  |  |  | 583,385 |
Predecessor | Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,680) |  |  |  |  | (26,733) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,060 |  |  |  |  | 26,538 |
Assets | [3] | 597,819 |  |  |  |  |  |  | 588,519 |  |  |  |  |  |  |  | 597,819 |  |  |  |  | 588,519 |
Predecessor | Operating Segments | West Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,828) |  |  |  |  | (24,662) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,632 |  |  |  |  | 44,204 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 |  |  |  |  | 743 |
Assets | [3] | 1,277,552 |  |  |  |  |  |  | 1,308,836 |  |  |  |  |  |  |  | 1,277,552 |  |  |  |  | 1,308,836 |
Predecessor | Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17,542) |  |  |  |  | (55,389) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 704 |  |  |  |  | 2,456 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 821 |  |  |  |  | 28,099 |
Assets | [5] | $ 799,752 |  |  |  |  |  |  | $ 863,486 |  |  |  |  |  |  |  | 799,752 |  |  |  |  | 863,486 |
Predecessor | Vessel Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,597 |  |  |  |  | 583,816 |
Predecessor | Vessel Revenues | Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,848 |  |  |  |  | 239,843 |
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,313 |  |  |  |  | 114,618 |
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,466 |  |  |  |  | 42,667 |
Predecessor | Vessel Revenues | Operating Segments | West Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,970 |  |  |  |  | 186,688 |
Predecessor | Other Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,772 |  |  |  |  | $ 17,795 |
[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] | 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:
[3] | Marine support services are conducted worldwide with assets that are highly mobile. Revenues are principally derived from offshore service vessels, which regularly and routinely move from one operating area to another, often to and from offshore operating areas in different continents. Because of this asset mobility, revenues and long-lived assets attributable to Tidewater's international marine operations in any one country are not material.
[4] | Restructuring-related professional services costs for the five month period from August 1, 2017 through December 31, 2017 are included in reorganization items. Included in corporate general and administrative expenses for the period four month period April 1, 2017 through July 31, 2017 (Predecessor) and year ended March 31, 2017 (Predecessor) were $6.7 million and $29 million of restructuring-related professional service costs, respectively.
[5] | Included in Corporate are vessels currently under construction which had not yet been assigned to a non-corporate reporting segment. The vessel construction costs will be reported in Corporate until the earlier of the vessels being assigned to a non-corporate reporting segment or the vessels' delivery. At December 31, 2017 (Successor), July 31, 2017 (Predecessor) and March 31, 2017 (Predecessor), was $9.3 million, $47.5 million and $52.4 million, respectively, of vessel construction costs were included in Corporate.
[6] | 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.

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