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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
Other Commitments [Line Items] |  |  |
Total lease expense | $ 7,863 | $ 3,076 | $ 3,840
Office and other leases |  |  |
Other Commitments [Line Items] |  |  |
Total lease expense | 1,697 | 1,861 | $ 3,840
Vessel operating leases |  |  |
Other Commitments [Line Items] |  |  |
Total lease expense | $ 6,166 | $ 1,215 |

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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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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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