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Business Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | $ 1,219,640 | $ 1,087,732 | $ 3,224,047 | $ 2,995,116 |
Earnings (Loss) from operations | 240,662 | 226,964 | 543,696 | 516,967 |
Total assets employed | 9,588,171 | 7,566,785 | 9,588,171 | 7,566,785 | $ 8,992,511
Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 1,142,218 | 1,022,487 | 3,024,300 | 2,811,646 |
Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 1,146,117 | 1,023,827 | 3,008,300 | 2,792,606 |
Earnings (Loss) from operations | 238,806 | 220,639 | 545,570 | 517,516 |
Total assets employed | 9,134,806 | 7,174,841 | 9,134,806 | 7,174,841 | 7,163,442
Building Materials Business | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 1,073,853 | 962,598 | 2,822,910 | 2,621,728 |
Operating Segments | Building Materials Business Mid-America Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 377,005 | 308,472 | 906,377 | 788,390 |
Earnings (Loss) from operations | 120,344 | 106,235 | 235,221 | 204,939 |
Total assets employed | 2,802,054 | 1,538,594 | 2,802,054 | 1,538,594 | 1,532,867
Operating Segments | Building Materials Business Mid-America Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 348,429 | 287,085 | 841,897 | 734,406 |
Operating Segments | Building Materials Business Southeast Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 125,547 | 94,843 | 318,749 | 277,474 |
Earnings (Loss) from operations | 26,372 | 17,882 | 60,464 | 42,331 |
Total assets employed | 1,300,090 | 604,144 | 1,300,090 | 604,144 | 616,344
Operating Segments | Building Materials Business Southeast Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 121,661 | 91,427 | 308,306 | 266,690 |
Operating Segments | Building Materials Business West Group |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 643,565 | 620,512 | 1,783,174 | 1,726,742 |
Earnings (Loss) from operations | 92,090 | 96,522 | 249,885 | 270,246 |
Total assets employed | 5,032,662 | 5,032,103 | 5,032,662 | 5,032,103 | 5,014,231
Operating Segments | Building Materials Business West Group | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 603,763 | 584,086 | 1,672,707 | 1,620,632 |
Operating Segments | Building Materials Business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 1,146,117 | 1,023,827 | 3,008,300 | 2,792,606 |
Operating Segments | Magnesia Specialties |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 73,523 | 63,905 | 215,747 | 202,510 |
Earnings (Loss) from operations | 23,301 | 17,590 | 65,867 | 58,589 |
Total assets employed | 141,998 | 148,581 | 141,998 | 148,581 | 152,257
Operating Segments | Magnesia Specialties | Products and Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 68,365 | 59,889 | 201,390 | 189,918 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings (Loss) from operations | (21,445) | (11,265) | (67,741) | (59,138) |
Total assets employed | $ 311,367 | $ 243,363 | $ 311,367 | $ 243,363 | $ 1,676,812

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