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Business Combination - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 27, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Combinations [Line Items] |  |  |  |  |
Total revenues |  | $ 1,219,640,000 | $ 1,087,732,000 | $ 3,224,047,000 | $ 2,995,116,000
Earnings from operations |  | 240,662,000 | 226,964,000 | 543,696,000 | 516,967,000
Acquisition-related expenses |  | 89,000 | $ 1,314,000 | 12,925,000 | 3,319,000
Bluegrass Materials Company |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Date of acquisition | Apr. 27, 2018 |  |  |  |
Gain on sale of business |  |  |  |  | 14,785,000
Purchase price | $ 1,617,357,000 |  |  |  |
Company acquired voting interest | 100.00% |  |  |  |
Total revenues |  | 68,656,000 |  | 115,007,000 |
Earnings from operations |  | 11,531,000 |  | 18,276,000 |
Acquisition-related expenses |  | $ 89,000 |  | $ 27,710,000 | 27,710,000
Increase in cost of sales |  |  |  |  | $ 19,893,000
Bluegrass Materials Company | Forsyth Quarry |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Gain on sale of business | $ 14,785,000 |  |  |  |
Bluegrass Materials Company | Beaver Creek |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Gain on sale of business | $ 0 |  |  |  |

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