v3.8.0.1

Segment Reporting - Schedule of Company's Revenue and Income From Operations by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 550,543 | $ 534,681 | $ 276,193
Voyage expenses | (53,604) | (18,727) | (9,968)
Vessel operating expenses | (182,598) | (137,164) | (98,403)
Time-charter hire expense | (59,647) | (74,898) | (32,706)
Depreciation and amortization | (104,149) | (73,760) | (53,292)
General and administrative expenses | (33,199) | (30,403) | (25,130)
(Loss) gain on sale of vessels | (20,594) | 771 | 9,955
Restructuring charge | 0 | (6,795) | (812)
Income (loss) from operations | 96,752 | 193,705 | 65,837
Equity income | 7,680 | 11,528 | $ 4,951
Ship-to-Ship Transfer [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 37,900 | 17,700 |
Operating Segments [Member] | Conventional Tanker [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 512,608 | 516,943 |
Voyage expenses | (56,805) | (18,379) |
Vessel operating expenses | (150,100) | (123,572) |
Time-charter hire expense | (57,368) | (74,860) |
Depreciation and amortization | (99,024) | (72,118) |
General and administrative expenses | (29,432) | (28,418) |
(Loss) gain on sale of vessels | (20,926) | 771 |
Restructuring charge |  | (6,468) |
Income (loss) from operations | 98,953 | 193,899 |
Equity income | 7,680 | 11,528 |
Operating Segments [Member] | Ship-to-Ship Transfer [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 41,136 | 18,587 |
Voyage expenses | 0 | (348) |
Vessel operating expenses | (32,498) | (14,441) |
Time-charter hire expense | (2,279) | (38) |
Depreciation and amortization | (5,125) | (1,642) |
General and administrative expenses | (3,767) | (1,985) |
(Loss) gain on sale of vessels | 332 | 0 |
Restructuring charge |  | (327) |
Income (loss) from operations | (2,201) | (194) |
Equity income | 0 | 0 |
Inter-segment Adjustment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (3,201) | (849) |
Voyage expenses | 3,201 | 0 |
Vessel operating expenses | 0 | 849 |
Time-charter hire expense | 0 | 0 |
Depreciation and amortization | 0 | 0 |
General and administrative expenses | 0 | 0 |
(Loss) gain on sale of vessels | 0 | 0 |
Restructuring charge |  | 0 |
Income (loss) from operations | 0 | 0 |
Equity income | $ 0 | 0 |
Estimated costs incurred |  | $ 25 |

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- Definition Total costs related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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