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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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