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Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Due to related parties: |  |
Due from related parties, net of due to related parties | $ 82,899 | $ 97,979
Sonatide Marine, Ltd. | ANGOLA |  |
Due from related parties: |  |
Total due from related parties | 94,140 | 109,176
Due to related parties: |  |
Total due to related parties | 27,450 | 29,347
DTDW Holdings, Ltd. | NIGERIA |  |
Due from related parties: |  |
Total due from related parties | 27,819 | 23,775
Due to related parties: |  |
Total due to related parties | $ 11,610 | $ 5,625

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