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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, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes | $ 54,181 | $ 83,689 | $ 89,373 | $ 67,276 | $ 52,322 | $ 68,205 | $ 42,840 | $ 55,885 | $ 294,519 | $ 219,252 | $ 252,927
Income Taxes at Statutory Rate |  |  |  |  |  |  |  |  | 103,082 | 76,738 | 88,524
Increases (Decreases) in Tax Resulting from - State Income Taxes, net |  |  |  |  |  |  |  |  | 1,668 | 1,166 | 4,582
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost |  |  |  |  |  |  |  |  | (1,216) | (5,672) | (4,367)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction |  |  |  |  |  |  |  |  | (7,615) | (6,302) | (6,853)
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance |  |  |  |  |  |  |  |  | 626 | 629 | 647
Increases (Decreases) in Tax Resulting from - IRS Settlement |  |  |  |  |  |  |  |  |  |  | (16,559)
Increases (Decreases) in Tax Resulting from - Other |  |  |  |  |  |  |  |  | (245) | 101 | 100
Provision for Income Taxes |  |  |  |  |  |  |  |  | $ 96,300 | $ 66,660 | $ 66,074
Effective Tax Rate |  |  |  |  |  |  |  |  | 33.00% | 30.00% | 26.00%

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