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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
U.S. Federal $ 58,895 $ 48,359 $ 47,263
State 12,909 9,362 10,031
Foreign 4,779 8,078 7,229
Current 76,583 65,799 64,523
Deferred:      
U.S. Federal 218 2,603 7,082
State 21 446 1,600
Foreign (199) (1,771) (392)
Deferred 40 1,278 8,290
Income tax expense $ 76,623 $ 67,077 $ 72,813