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Revenue Recognition - Schedule of Company's Total Revenues by Category for each Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue Recognition [Line Items] |  |  |  |
Total | $ 1,279,468 | $ 1,202,403 | $ 2,218,423 | $ 2,004,407
Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,203,229 | 1,129,441 | 2,068,110 | 1,862,183
Products and Services |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,196,135 | 1,128,777 | 2,074,440 | 1,882,082
Products and Services | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,125,756 | 1,060,620 | 1,934,887 | 1,749,057
Freight |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 83,333 | 73,626 | 143,983 | 122,325
Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 77,473 | 68,821 | 133,223 | 113,126
Operating Segments | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 415,327 | 350,592 | 664,140 | 529,373
Operating Segments | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 137,024 | 112,963 | 256,262 | 193,202
Operating Segments | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 650,878 | 665,886 | 1,147,708 | 1,139,608
Operating Segments | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,203,229 | 1,129,441 | 2,068,110 | 1,862,183
Operating Segments | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 76,239 | 72,962 | 150,313 | 142,224
Operating Segments | Products and Services | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 382,717 | 325,578 | 613,025 | 493,468
Operating Segments | Products and Services | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 132,036 | 109,082 | 247,348 | 186,646
Operating Segments | Products and Services | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 611,003 | 625,960 | 1,074,514 | 1,068,943
Operating Segments | Products and Services | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 70,379 | 68,157 | 139,553 | 133,025
Operating Segments | Freight | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 32,610 | 25,014 | 51,115 | 35,905
Operating Segments | Freight | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 4,988 | 3,881 | 8,914 | 6,556
Operating Segments | Freight | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 39,875 | 39,926 | 73,194 | 70,665
Operating Segments | Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 77,473 | 68,821 | 133,223 | 113,126
Operating Segments | Freight | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | $ 5,860 | $ 4,805 | $ 10,760 | $ 9,199

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