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Schedule of Effective Tax Rates Vary from Federal Statutory Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes | $ 45,218 | $ (148,565) | $ 94,210 | $ 54,861 | $ (171,597) | $ 74,518 | $ 91,793 | $ 85,021 | $ 45,724 | $ 79,735 | $ 271,962
Income Taxes at Statutory Rate |  |  |  |  |  |  |  |  | 9,602 | 16,744 | 85,804
Increases (Decreases) in Tax Resulting from - State Income Taxes, net |  |  |  |  |  |  |  |  | (1,703) | (629) | 6,139
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost |  |  |  |  |  |  |  |  | (3,078) | (3,834) | (6,341)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction |  |  |  |  |  |  |  |  |  |  | (5,995)
Increases (Decreases) in Tax Resulting from - Excess Tax Benefit from Stock Compensation |  |  |  |  |  |  |  |  | 307 | (651) | (4,129)
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance |  |  |  |  |  |  |  |  | 537 | 610 | 567
Increases (Decreases) in Tax Resulting from - Limitation on Officer's Compensation |  |  |  |  |  |  |  |  | 1,018 | 1,434 | 246
Increases (Decreases) in Tax Resulting from - Impact of Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  |  |  | (61,692)
Increase (Decreases in Tax Resulting from -Impact of CARES Act of 2020 |  |  |  |  |  |  |  |  | (35,936) |  |
Increases (Decreases) in Tax Resulting from - Credits |  |  |  |  |  |  |  |  | (2,150) | (940) |
Increases (Decreases) in Tax Resulting from - Valuation Allowance |  |  |  |  |  |  |  |  | 2,212 | (2,100) |
Increases (Decreases) in Tax Resulting from - Unrecognized Tax Benefits |  |  |  |  |  |  |  |  | 4,200 |  |
Increases (Decreases) in Tax Resulting from - Other |  |  |  |  |  |  |  |  | (179) | 241 | 731
Provision (Benefit) for Income Taxes |  |  |  |  |  |  |  |  | $ (25,170) | $ 10,875 | $ 15,330
Effective Tax Rate |  |  |  |  |  |  |  |  | (55.00%) | 14.00% | 6.00%

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