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Schedule of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Federal, Current $ 48,794 $ 18,453 $ 11,748
State, Current 4,077 3,681 2,997
Foreign, Current 4,074 4,941 7,565
Income tax expense (benefit), Current, total 56,945 27,075 22,310
Federal, Deferred 88 (4,742) 9,215
State, Deferred (1,342) (890) 693
Foreign, Deferred (727) 695 (285)
Income tax expense (benefit), Deferred, total (1,981) (4,937) 9,623
Total provision $ 54,964 $ 22,138 $ 31,933