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Goodwill, Intangible Assets and In-Process Revenue Contracts - Summary of Intangible Assets (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) vessel | Dec. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 233,594 | $ 340,722
Accumulated Amortization | (140,580) | (251,547)
Net Carrying Amount | 93,014 | 89,175
Customer contracts |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 193,194 | 317,222
Accumulated Amortization | (131,647) | (245,705)
Net Carrying Amount | 61,547 | 71,517
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,500 | 22,500
Accumulated Amortization | (8,005) | (4,842)
Net Carrying Amount | 14,495 | 17,658
Off-market in-charter contracts |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,900 |
Accumulated Amortization | (928) |
Net Carrying Amount | $ 16,972 |
Other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 1,000
Accumulated Amortization |  | (1,000)
Net Carrying Amount |  | $ 0
Other intangible assets | FSO |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Number of vessels | vessel | 2 |

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