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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense Benefit [Line Items]      
Current $ 140,800 $ 101,902 $ 194,149
Deferred 16,735 66,121 (22,324)
Taxes on income 157,535 168,023 171,825
Domestic 132,027 112,615 166,152
Foreign 25,508 55,408 5,673
Taxes on income 157,535 168,023 171,825
Domestic Tax Authority      
Income Tax Expense Benefit [Line Items]      
Current 120,876 94,340 175,522
Deferred 11,151 18,275 (9,370)
Domestic 132,027 112,615 166,152
U.S.      
Income Tax Expense Benefit [Line Items]      
Foreign taxes, Current 19,925 7,562 18,627
Foreign taxes, Deferred 5,583 47,846 (12,954)
Foreign $ 25,508 $ 55,408 $ 5,673