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Financial Information Related to Operations by Segment (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2021
USD ($)
kT
Mar. 31, 2020
USD ($)
kT
Mar. 31, 2019
USD ($)
kT
Segment Reporting Information [Line Items]                      
Revenue $ 343,302 $ 404,667 $ 447,684 $ 426,989 $ 305,195 $ 342,904 $ 400,569 $ 355,365 $ 1,622,642 $ 1,404,033 $ 1,310,254
Less: Joint Venture Revenue                 (105,191) (113,536) (104,493)
Operating Earnings                 445,796 385,251 386,667
Other                   (3,230) (7,161)
Corporate General and Administrative Expense                 (49,511) (65,410) (37,371)
Gain on Sale of Businesses                 51,973    
Impairment Losses                   (25,131) (37,179)
Litigation Settlements and Losses                     (1,800)
Other Non-Operating Income (Loss)                 20,274 (594) 1,835
Earnings Before Interest and Income Taxes                 468,532 294,116 312,152
Interest Expense, net                 (44,420) (38,421) (28,374)
Earnings Before Income Taxes 79,442 $ 105,072 $ 109,671 $ 129,927 43,607 $ 56,157 $ 98,367 $ 57,564 424,112 255,695 283,778
Capital Expenditures                 53,933 131,973 116,587
Depreciation, Depletion, and Amortization                 129,087 113,518 122,535
Capital Expenditures                   146 52,286
Depreciation and Amortization                 221 11,310 31,328
Identifiable Assets 2,838,681       2,961,020       2,838,681 2,961,020 2,169,163
Assets of Discontinued Operations         13,831         13,831 222,890
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,815,901 1,602,885 1,497,300
Operating Earnings                 233,957 181,330 164,782
Depreciation, Depletion, and Amortization                 128,866 102,208 91,207
Operating Segments [Member] | Wholly-Owned [Member]                      
Segment Reporting Information [Line Items]                      
Operating Earnings                 196,516 138,745 126,217
Operating Segments [Member] | Joint Venture [Member]                      
Segment Reporting Information [Line Items]                      
Operating Earnings                 37,441 42,585 38,565
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (88,068) (85,316) (82,553)
Revenue                 (88,068) (85,316) (82,553)
Cement [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 $ 944,556 $ 752,002 $ 656,759
Cement Sales Volume | kT                 7,466 5,931 5,340
Operating Earnings                 $ 233,957 $ 181,330 $ 164,782
Capital Expenditures                 26,708 44,776 76,504
Depreciation, Depletion, and Amortization                 77,524 59,081 52,802
Identifiable Assets 1,898,930       1,980,306       $ 1,898,930 $ 1,980,306 $ 1,289,468
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]                      
Segment Reporting Information [Line Items]                      
Cement Sales Volume | kT                 6,576 4,975 4,441
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]                      
Segment Reporting Information [Line Items]                      
Cement Sales Volume | kT                 890 956 899
Cement [Member] | Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 $ (20,862) $ (21,499) $ (14,408)
Concrete and Aggregates [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 168,829 182,775 140,173
Operating Earnings                 19,054 17,558 12,866
Capital Expenditures                 3,114 11,898 6,649
Depreciation, Depletion, and Amortization                 10,807 11,142 8,176
Identifiable Assets 88,410       136,041       88,410 136,041 95,084
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (106) (1,502) (1,422)
Gypsum Wallboard [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 539,009 508,145 532,712
Operating Earnings                 167,336 154,614 180,831
Capital Expenditures                 12,889 12,771 10,724
Depreciation, Depletion, and Amortization                 21,646 20,320 20,020
Identifiable Assets 366,352       375,946       366,352 375,946 372,206
Paperboard [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 163,507 159,963 167,656
Operating Earnings                 25,449 34,979 35,349
Capital Expenditures                 11,222 62,528 16,603
Depreciation, Depletion, and Amortization                 13,913 8,945 8,541
Identifiable Assets 186,156       183,288       186,156 183,288 138,614
Paperboard [Member] | Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (67,100) (62,315) (66,723)
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation, Depletion, and Amortization                 4,976 2,720 1,668
Identifiable Assets $ 298,833       $ 271,608       $ 298,833 $ 271,608 50,901
Corporate and Other [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Capital Expenditures                     $ 6,107