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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue Recognition [Line Items] |  |  |  |
Total | $ 1,202,403 | $ 1,063,524 | $ 2,004,407 | $ 1,907,383
Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,129,441 | 993,495 | 1,862,183 | 1,768,778
Products and Services |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,128,777 | 996,843 | 1,882,082 | 1,789,159
Products and Services | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,060,620 | 931,115 | 1,749,057 | 1,659,130
Freight |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 73,626 | 66,681 | 122,325 | 118,224
Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 68,821 | 62,380 | 113,126 | 109,648
Operating Segments | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 350,592 | 290,898 | 529,373 | 479,918
Operating Segments | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 112,963 | 92,348 | 193,202 | 182,630
Operating Segments | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 665,886 | 610,249 | 1,139,608 | 1,106,230
Operating Segments | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 1,129,441 | 993,495 | 1,862,183 | 1,768,778
Operating Segments | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 72,962 | 70,029 | 142,224 | 138,605
Operating Segments | Products and Services | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 325,578 | 269,914 | 493,468 | 447,321
Operating Segments | Products and Services | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 109,082 | 88,538 | 186,646 | 175,264
Operating Segments | Products and Services | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 625,960 | 572,663 | 1,068,943 | 1,036,545
Operating Segments | Products and Services | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 68,157 | 65,728 | 133,025 | 130,029
Operating Segments | Freight | Building Materials Business Mid-America Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 25,014 | 20,984 | 35,905 | 32,597
Operating Segments | Freight | Building Materials Business Southeast Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 3,881 | 3,810 | 6,556 | 7,366
Operating Segments | Freight | Building Materials Business West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 39,926 | 37,586 | 70,665 | 69,685
Operating Segments | Freight | Building Materials Business |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | 68,821 | 62,380 | 113,126 | 109,648
Operating Segments | Freight | Magnesia Specialties |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Total | $ 4,805 | $ 4,301 | $ 9,199 | $ 8,576

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