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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability   $ 2,642
Pension liabilities $ 33,124 36,614
Liability for uncertain tax positions 43,790 23,043
Deferred tax liability 1,913  
Other [1] 11,075 9,692
Other liabilities and deferred credits $ 89,902 $ 71,991
[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.