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Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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