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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 211,641 | $ 209,454 | $ 180,895
State | 37,006 | 38,095 | 36,142
Deferred: |  |  |
Federal | 60,785 | (9,230) | 2,681
State | (42) | (1,884) | 567
Total | $ 309,390 | $ 236,435 | $ 220,285

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