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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 228,505 | $ 215,950 | $ 137,573
State |  |  |  |  |  |  |  |  | 24,336 | 26,057 | 43,282
Total current provision |  |  |  |  |  |  |  |  | 252,841 | 242,007 | 180,855
Deferred (benefit)/provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (89,518) | (69,546) | (40,370)
State |  |  |  |  |  |  |  |  | 786 | (7,681) | (518)
Total deferred (benefit)/provision |  |  |  |  |  |  |  |  | (88,732) | (77,227) | (40,888)
Provision for income tax expense | $ 43,122 | $ 47,557 | $ 34,555 | $ 38,875 | $ 54,915 | $ 17,985 | $ 60,158 | $ 31,722 | $ 164,109 | $ 164,780 | $ 139,967

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