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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 215,950 | $ 137,573 | $ 130,854
State |  |  |  |  |  |  |  |  | 26,057 | 43,282 | 13,513
Total current provision |  |  |  |  |  |  |  |  | 242,007 | 180,855 | 144,367
Deferred (benefit)/provision: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (69,546) | (40,370) | 13,240
State |  |  |  |  |  |  |  |  | (7,681) | (518) | 1,327
Total deferred (benefit)/provision |  |  |  |  |  |  |  |  | (77,227) | (40,888) | 14,567
Provision for income tax expense | $ 54,915 | $ 17,985 | $ 60,158 | $ 31,722 | $ 24,465 | $ 54,903 | $ 31,941 | $ 28,658 | $ 164,780 | $ 139,967 | $ 158,934

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