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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) vessel | Dec. 31, 2019 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 233,594 | $ 196,146
Accumulated Amortization | (155,821) | (150,221)
Net Carrying Amount | 77,773 | 45,925
Customer contracts |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 193,194 | 192,938
Accumulated Amortization | (140,756) | (149,558)
Net Carrying Amount | 52,438 | 43,380
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,500 | 3,208
Accumulated Amortization | (10,875) | (663)
Net Carrying Amount | 11,625 | $ 2,545
Off-market in-charter contracts |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,900 |
Accumulated Amortization | (4,190) |
Net Carrying Amount | $ 13,710 |
Off-market in-charter contracts | FSO |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Number of vessels | vessel | 2 |

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