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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, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes | $ 48,725 | $ 51,388 | $ 92,319 | $ 79,530 | $ 54,181 | $ 83,689 | $ 89,373 | $ 67,276 | $ 271,962 | $ 294,519 | $ 219,252
Income Taxes at Statutory Rate |  |  |  |  |  |  |  |  | 85,804 | 103,082 | 76,738
Increases (Decreases) in Tax Resulting from - State Income Taxes, net |  |  |  |  |  |  |  |  | 6,139 | 1,668 | 1,166
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost |  |  |  |  |  |  |  |  | (6,341) | (1,216) | (5,672)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction |  |  |  |  |  |  |  |  | (5,995) | (7,615) | (6,302)
Increases (Decreases) in Tax Resulting from - Excess Tax Benefit from Stock Compensation |  |  |  |  |  |  |  |  | (4,129) |  |
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance |  |  |  |  |  |  |  |  | 567 | 626 | 629
Increases (Decreases) in Tax Resulting from - Limitation on Officer's Compensation |  |  |  |  |  |  |  |  | 246 |  |
Increases (Decreases) in Tax Resulting from - Impact of Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  | (61,692) |  |
Increases (Decreases) in Tax Resulting from - Other |  |  |  |  |  |  |  |  | 731 | (245) | 101
Provision for Income Taxes |  |  |  |  |  |  |  |  | $ 15,330 | $ 96,300 | $ 66,660
Effective Tax Rate |  |  |  |  |  |  |  |  | 6.00% | 33.00% | 30.00%

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