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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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