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Components of Provision for (Benefit from) 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 $ 29,848 $ 22,239 $ 84,743
State and local 2,880 1,418 5,323
Foreign 3,975 3,557 3,836
Current income tax expense, total 36,703 27,214 93,902
Federal 12,446 (78,428) (17,741)
State and local 32,336 (6,012) (8,770)
Foreign (318) (143,614) (50,316)
Deferred income tax expense (benefit), total 44,464 (228,054) (76,827)
Provision for (benefit from) income taxes $ 81,167 $ (200,840) $ 17,075