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Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
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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- Definition

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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