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Schedule of Effective Tax Rates Vary from Federal Statutory Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes | $ (171,597) | $ 74,518 | $ 91,793 | $ 85,021 | $ 48,725 | $ 51,388 | $ 92,319 | $ 79,530 | $ 79,735 | $ 271,962 | $ 294,519
Income Taxes at Statutory Rate |  |  |  |  |  |  |  |  | 16,744 | 85,804 | 103,082
Increases (Decreases) in Tax Resulting from - State Income Taxes, net |  |  |  |  |  |  |  |  | (629) | 6,139 | 1,668
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost |  |  |  |  |  |  |  |  | (3,834) | (6,341) | (1,216)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction |  |  |  |  |  |  |  |  |  | (5,995) | (7,615)
Increases (Decreases) in Tax Resulting from - Excess Tax Benefit from Stock Compensation |  |  |  |  |  |  |  |  | (651) | (4,129) |
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance |  |  |  |  |  |  |  |  | 610 | 567 | 626
Increases (Decreases) in Tax Resulting from - Limitation on Officer's Compensation |  |  |  |  |  |  |  |  | 1,434 | 246 |
Increases (Decreases) in Tax Resulting from - Impact of Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  |  | (61,692) |
Increases (Decreases) in Tax Resulting from - Credits |  |  |  |  |  |  |  |  | (940) |  |
Increases (Decreases) in Tax Resulting from - Valuation Allowance |  |  |  |  |  |  |  |  | (2,100) |  |
Increases (Decreases) in Tax Resulting from - Other |  |  |  |  |  |  |  |  | 241 | 731 | (245)
Provision for Income Taxes |  |  |  |  |  |  |  |  | $ 10,875 | $ 15,330 | $ 96,300
Effective Tax Rate |  |  |  |  |  |  |  |  | 14.00% | 6.00% | 33.00%

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