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Comparison of Total Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | $ 1,553,124 | $ 1,579,528
Operating Segments | Americas |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 369,592 | 375,297
Operating Segments | Middle East/Asia Pacific |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 272,426 | 270,413
Operating Segments | Europe/Mediterranean |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 342,394 | 358,943
Operating Segments | West Africa |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 374,040 | 376,087
Corporate |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | $ 194,672 | $ 198,788

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