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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.