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Summary of Aggregate Operating Lease Expenses (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 31, 2017
Other Commitments [Line Items] |  |  |  |
Total lease expense |  | $ 3,076 | $ 3,840 |
Office and other leases |  |  |  |
Other Commitments [Line Items] |  |  |  |
Total lease expense |  | 1,861 | $ 3,840 |
Vessel operating leases |  |  |  |
Other Commitments [Line Items] |  |  |  |
Total lease expense |  | $ 1,215 |  |
Predecessor |  |  |  |
Other Commitments [Line Items] |  |  |  |
Total lease expense | $ 7,863 |  |  | $ 38,898
Predecessor | Office and other leases |  |  |  |
Other Commitments [Line Items] |  |  |  |
Total lease expense | 1,697 |  |  | 5,132
Predecessor | Vessel operating leases |  |  |  |
Other Commitments [Line Items] |  |  |  |
Total lease expense | $ 6,166 |  |  | $ 33,766

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Details
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