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Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Due from related parties: |  |
Total due from related parties | $ 65,766 | $ 125,972
Total due from related parties | 65,766 | 125,972
Due to related parties: |  |
Total due to related parties | 48,803 | 50,186
Due from related parties, net of due to related parties | 16,963 | 75,786
Total due to related parties | 48,803 | 50,186
Sonatide Marine, Ltd. | ANGOLA |  |
Due from related parties: |  |
Total due from related parties | 47,353 | 89,246
Total due from related parties | 47,353 | 89,246
Due to related parties: |  |
Total due to related parties | 30,390 | 31,475
Total due to related parties | 30,390 | 31,475
DTDW Holdings, Ltd. | NIGERIA |  |
Due from related parties: |  |
Total due from related parties | 18,413 | 36,726
Total due from related parties | 18,413 | 36,726
Due to related parties: |  |
Total due to related parties | 18,413 | 18,711
Total due to related parties | $ 18,413 | $ 18,711

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