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Related Party Balances - Schedule of Balances with Related Parties (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Due to related parties:
Due from related parties, net of due to related parties	$ 134,706	$ 154,575
Sonatide | ANGOLA
Due from related parties:
Total due from related parties	152,826	230,315
Due to related parties:
Total due to related parties	46,742	99,448
DTDW | NIGERIA
Due from related parties:
Total due from related parties	44,233	33,353
Due to related parties:
Total due to related parties	$ 15,611	$ 9,645

X

- 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).

+ References

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-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08(k)(1))
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- Definition

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).

+ References

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- Definition

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.

+ References

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