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Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Due to related parties: |  |
Due from related parties, net of due to related parties | $ 97,979 | $ 154,575
Sonatide Marine, Ltd. | ANGOLA |  |
Due from related parties: |  |
Total due from related parties | 109,176 | 230,315
Due to related parties: |  |
Total due to related parties | 29,347 | 99,448
DTDW Holdings, Ltd. | NIGERIA |  |
Due from related parties: |  |
Total due from related parties | 23,775 | 33,353
Due to related parties: |  |
Total due to related parties | $ 5,625 | $ 9,645

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