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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components Of Income Tax Expense Benefit [Line Items]      
U.S. Federal $ 69,079 $ 86,719 $ 85,585
State 10,643 9,801 9,431
Foreign 10,499 9,416 9,661
Income tax expense 90,221 105,936 104,677
Current 100,956 103,216 99,990
Deferred (10,735) 2,720 4,687
Income tax expense $ 90,221 $ 105,936 $ 104,677