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Quarterly Results (unaudited) (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 284,701	$ 333,285	$ 381,499	$ 393,756	$ 284,713	$ 359,371	$ 376,315	$ 366,121	$ 1,393,241	$ 1,386,520	$ 1,211,220
Gross Profit	56,582	80,421	97,931	91,634	61,377	94,566	96,754	86,059	326,568	338,756	312,045
Earnings (Loss) 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
Net Earnings (Loss)	$ (127,797)	$ 57,715	$ 72,603	$ 66,339	$ 37,008	$ 101,380	$ 63,362	$ 54,882	$ 68,860	$ 256,632	$ 198,219
Diluted Earnings (Loss) Per Share	$ (2.82)	$ 1.24	$ 1.53	$ 1.38	$ 0.76	$ 2.08	$ 1.31	$ 1.13	$ 1.47	$ 5.28	$ 4.10

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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