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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, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings Before Income Taxes | $ 52,322 | $ 68,205 | $ 42,840 | $ 55,885 | $ 44,698 | $ 77,866 | $ 74,577 | $ 55,786 | $ 219,252 | $ 252,927 | $ 181,804
Income Taxes at Statutory Rate |  |  |  |  |  |  |  |  | 76,738 | 88,524 | 63,631
Increases (Decreases) in Tax Resulting from - State Income Taxes, net |  |  |  |  |  |  |  |  | 1,166 | 4,582 | 173
Increases (Decreases) in Tax Resulting from - Statutory Depletion in Excess of Cost |  |  |  |  |  |  |  |  | (5,672) | (4,367) | (3,512)
Increases (Decreases) in Tax Resulting from - Domestic Production Activities Deduction |  |  |  |  |  |  |  |  | (6,302) | (6,853) | (3,453)
Increases (Decreases) in Tax Resulting from - Meals and Entertainment Disallowance |  |  |  |  |  |  |  |  | 629 | 647 | 503
Increases (Decreases) in Tax Resulting from - Penalties on Uncertain Tax Positions |  |  |  |  |  |  |  |  |  |  | 213
Increases (Decreases) in Tax Resulting from - IRS Settlement |  |  |  |  |  |  |  |  |  | (16,559) |
Increases (Decreases) in Tax Resulting from - Other |  |  |  |  |  |  |  |  | 101 | 100 | 6
Provision for Income Taxes |  |  |  |  |  |  |  |  | $ 66,660 | $ 66,074 | $ 57,561
Effective Tax Rate |  |  |  |  |  |  |  |  | 30.00% | 26.00% | 32.00%

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