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Financial Information Related to Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]                      
Net Revenues                 $ 898,396 $ 642,562 $ 495,023
Operating Earnings                 224,638 134,520 69,361
Corporate General and Administrative                 (24,552) (23,918) (19,617)
Capital Expenditures                 59,490 53,011 26,099
Other Corporate Charges                   (10,683) (9,117)
Depreciation, Depletion and Amortization                 70,021 56,850 50,124
Earnings Before Interest and Income Taxes                 200,086 99,919 40,627
Identifiable Assets 1,511,529       1,476,233       1,511,529 1,476,233 985,145
Loss on Debt Retirement                     (2,094)
Interest Expense, net                 (18,282) (15,823) (16,621)
Earnings Before Income Taxes 29,767 48,833 58,688 44,516 10,756 27,301 26,125 19,914 181,804 84,096 21,912
Joint Venture [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 111,393 96,322 86,140
Cement [Member]
                     
Segment Reporting Information [Line Items]                      
Cement Sales Volume                 4,593,000 3,303,000 2,723,000
Operating Earnings                 89,486 46,228 46,850
Identifiable Assets 762,578       756,158       762,578 756,158 313,559
Cement [Member] | Joint Venture [Member]
                     
Segment Reporting Information [Line Items]                      
Cement Sales Volume                 1,013,000 913,000 866,000
Operating Earnings                 37,811 32,507 28,528
Cement [Member] | Wholly-Owned [Member]
                     
Segment Reporting Information [Line Items]                      
Cement Sales Volume                 3,580,000 2,390,000 1,857,000
Operating Earnings                 51,675 13,721 18,322
Gypsum Wallboard [Member]
                     
Segment Reporting Information [Line Items]                      
Identifiable Assets 412,566       425,866       412,566 425,866 434,967
Paperboard [Member]
                     
Segment Reporting Information [Line Items]                      
Identifiable Assets 125,045       129,226       125,045 129,226 137,483
Other Segments [Member]
                     
Segment Reporting Information [Line Items]                      
Identifiable Assets 31,777       29,000       31,777 29,000 38,096
Aggregates [Member]
                     
Segment Reporting Information [Line Items]                      
Identifiable Assets 152,728       108,796       152,728 108,796 49,009
Concrete [Member]
                     
Segment Reporting Information [Line Items]                      
Identifiable Assets 26,835       27,187       26,835 27,187 12,031
Operating Segments [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 1,071,883 788,871 625,920
Operating Segments [Member] | Cement [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 438,224 304,125 243,978
Operating Earnings                 89,486 46,228 46,850
Capital Expenditures                 12,226 15,583 7,753
Depreciation, Depletion and Amortization                 31,829 20,658 15,373
Operating Segments [Member] | Gypsum Wallboard [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 387,016 306,529 217,633
Operating Earnings                 114,852 69,712 6,264
Capital Expenditures                 4,825 2,682 3,357
Depreciation, Depletion and Amortization                 20,981 21,045 20,903
Operating Segments [Member] | Paperboard [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 130,178 121,930 118,794
Operating Earnings                 23,610 25,200 16,988
Capital Expenditures                 3,354 804 919
Depreciation, Depletion and Amortization                 8,716 8,824 8,595
Operating Segments [Member] | Concrete and Aggregates [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 116,465 56,287 45,515
Operating Earnings                 (4,678) (5,388) (1,097)
Operating Segments [Member] | Aggregates [Member]
                     
Segment Reporting Information [Line Items]                      
Capital Expenditures                 34,719 33,829 13,639
Depreciation, Depletion and Amortization                 5,119 3,820 3,365
Operating Segments [Member] | Concrete [Member]
                     
Segment Reporting Information [Line Items]                      
Capital Expenditures                 4,117 103 321
Depreciation, Depletion and Amortization                 1,793 1,392 1,022
Operating Segments [Member] | Corporate and Other [Member]
                     
Segment Reporting Information [Line Items]                      
Depreciation, Depletion and Amortization                 1,583 1,111 866
Intersegment Eliminations [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 62,094 49,987 44,757
Intersegment Eliminations [Member] | Cement [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 8,952 2,850 3,605
Intersegment Eliminations [Member] | Paperboard [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 52,119 46,393 40,485
Intersegment Eliminations [Member] | Concrete and Aggregates [Member]
                     
Segment Reporting Information [Line Items]                      
Net Revenues                 1,023 744 667
Segment Reconciling Items [Member] | Other Segments [Member]
                     
Segment Reporting Information [Line Items]                      
Operating Earnings                 1,368 (1,232) 356
Corporate, Non-Segment [Member] | Other Segments [Member]
                     
Segment Reporting Information [Line Items]                      
Capital Expenditures                 $ 249 $ 10 $ 110