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Revenues and Gross Profit - Total Revenues and Gross Profit by Product Line (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Product Information [Line Items] |  |  |  |
Total revenues | $ 1,279,468 | $ 1,202,403 | $ 2,218,423 | $ 2,004,407
Gross profit (loss) | 356,867 | 315,917 | 499,774 | 426,309
Interproduct Revenues |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | (67,772) | (78,178) | (126,135) | (138,843)
Corporate |  |  |  |
Product Information [Line Items] |  |  |  |
Gross profit (loss) | 195 | 3,168 | (279) | 5,053
Building Materials Business |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,203,229 | 1,129,441 | 2,068,110 | 1,862,183
Building Materials Business | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,203,229 | 1,129,441 | 2,068,110 | 1,862,183
Gross profit (loss) | 328,634 | 288,907 | 446,473 | 373,526
Building Materials Business | Operating Segments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 1,125,756 | 1,060,620 | 1,934,887 | 1,749,057
Gross profit (loss) | 328,407 | 288,309 | 446,410 | 373,046
Magnesia Specialties | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 76,239 | 72,962 | 150,313 | 142,224
Gross profit (loss) | 28,038 | 23,842 | 53,580 | 47,730
Magnesia Specialties | Operating Segments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 70,379 | 68,157 | 139,553 | 133,025
Gross profit (loss) | 29,212 | 24,870 | 55,819 | 49,933
Aggregates | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 757,802 | 666,966 | 1,302,750 | 1,094,139
Gross profit (loss) | 251,422 | 198,705 | 349,482 | 252,246
Cement | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 112,350 | 113,148 | 211,367 | 202,331
Gross profit (loss) | 42,229 | 41,305 | 56,007 | 65,038
Ready Mixed Concrete | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 241,178 | 277,202 | 452,335 | 495,738
Gross profit (loss) | 19,014 | 29,952 | 33,506 | 45,593
Asphalt and Paving | Building Materials Business | Operating Segments | Reportable Subsegments | Products and Services |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 82,198 | 81,482 | 94,570 | 95,692
Gross profit (loss) | 15,742 | 18,347 | 7,415 | 10,169
Freight |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 83,333 | 73,626 | 143,983 | 122,325
Freight | Building Materials Business |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 77,473 | 68,821 | 133,223 | 113,126
Freight | Building Materials Business | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 77,473 | 68,821 | 133,223 | 113,126
Gross profit (loss) | 227 | 598 | 63 | 480
Freight | Magnesia Specialties | Operating Segments |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 5,860 | 4,805 | 10,760 | 9,199
Gross profit (loss) | $ (1,174) | $ (1,028) | $ (2,239) | $ (2,203)

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