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Comparison of Total Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 1,415,675	$ 1,579,528
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets	350,376	375,297
Operating Segments | Middle East/Asia Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets	243,519	270,413
Operating Segments | Europe/Mediterranean
Segment and Geographic Distribution of Operations [Line Items]
Assets	327,827	358,943
Operating Segments | West Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets	280,018	376,087
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 213,935	$ 198,788

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- Definition

Segment and Geographic Distribution of Operations [Line Items]

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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