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Bluegrass Acquisition - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Line Items] |  |  |  |  |
Business acquisition in cash |  |  |  |  | $ 1,640,698
Total Revenues |  | $ 1,420,246 | $ 1,219,640 | $ 3,638,668 | 3,224,047
Earnings (Loss) from operations |  | 345,263 | 240,662 | 700,365 | 543,696
Bluegrass Materials Company |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business acquisition in cash | $ 1,620,000 |  |  |  |
Total Revenues |  | 79,500 | 68,700 | 202,700 | 115,000
Earnings (Loss) from operations |  | $ 31,100 | $ 11,500 | $ 60,600 | $ 18,300

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