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Schedule of Other Liabilities and Deferred Credits (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items] |  |  |
Other | [1] | $ 11,075 | $ 9,692
St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland |  |  |
Schedule of Accrued Liabilities [Line Items] |  |  |
Other |  | 3,800 |
Charge incurred on abandonment of office leases |  | $ 5,500 |
[1] | Includes $3.8 million as of December 31, 2018 related to a $5.5 million charge incurred during the twelve months ended December 31, 2018 relating to the abandonment of office leases for duplicate facilities in St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland.

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- Definition Other Liabilities, Credits, Noncurrent + References No definition available. + Details
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- Definition Schedule of Accrued Liabilities [Line Items] + References No definition available. + Details
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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888415&loc=SL77918607-209975 + Details
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- Details
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