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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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