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Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current expense (benefit):      
Federal $ 9,969 $ 58,816 $ 38,831
State (794) 1,173 363
Foreign 15,690 10,364 7,124
Total current income tax expense 24,865 70,353 46,318
Deferred expense (benefit):      
Federal 16,563 (22,951) (18,755)
State 784 25 (610)
Foreign 9,837 (9,222) 209
Total deferred income tax expense 27,184 (32,148) (19,156)
Total income tax expense (benefit) $ 52,049 $ 38,205 $ 27,162