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Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Due from related parties: |  |
Total due from related parties | $ 128,204 | $ 125,972
Total due from related parties | 128,204 | 125,972
Due to related parties: |  |
Total due to related parties | 50,013 | 50,186
Due from related parties, net of due to related parties | 78,191 | 75,786
Total due to related parties | 50,013 | 50,186
Sonatide Marine, Ltd. | ANGOLA |  |
Due from related parties: |  |
Total due from related parties | 94,958 | 89,246
Total due from related parties | 94,958 | 89,246
Due to related parties: |  |
Total due to related parties | 30,774 | 31,475
Total due to related parties | 30,774 | 31,475
DTDW Holdings, Ltd. | NIGERIA |  |
Due from related parties: |  |
Total due from related parties | 33,246 | 36,726
Total due from related parties | 33,246 | 36,726
Due to related parties: |  |
Total due to related parties | 19,239 | 18,711
Total due to related parties | $ 19,239 | $ 18,711

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