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Quarterly Results (unaudited) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 315,442 $ 350,249 $ 414,526 $ 370,597 $ 284,701 $ 333,285 $ 381,499 $ 393,756 $ 1,450,814 $ 1,393,241 $ 1,386,520
Gross Profit 63,913 87,514 104,506 75,329 56,582 80,421 97,931 91,634 331,262 326,568 338,756
Earnings (Loss) Before Income Taxes 45,218 (148,565) 94,210 54,861 (171,597) 74,518 91,793 85,021 45,724 79,735 271,962
Net Earnings (Loss) $ 72,429 $ (114,632) $ 71,793 $ 41,304 $ (127,797) $ 57,715 $ 72,603 $ 66,339 $ 70,894 $ 68,860 $ 256,632
Diluted Earnings (Loss) Per Share $ 1.74 $ (2.77) $ 1.72 $ 0.94 $ (2.82) $ 1.24 $ 1.53 $ 1.38 $ 1.68 $ 1.47 $ 5.28