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Sale of Businesses - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 17, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Gain (Loss) on sale of Subsidiary |  | $ 51,973 |  |
Assets |  | 3,015,164 |  | $ 2,961,020
Liabilities |  | 1,947,206 |  | $ 1,993,177
Revenue |  | 428,020 | $ 370,597 |
Operating Earnings |  | 108,775 | 84,761 |
Mathews Readymix LLC and Western Aggregates LLC [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Purcahse price of acquisition | $ 93,500 |  |  |
Gain (Loss) on sale of Subsidiary | 52,000 |  |  |
Assets | 43,800 |  |  |
Liabilities | $ 2,300 |  |  |
Revenue |  | 1,700 | 7,800 |
Operating Earnings |  | $ 100 | $ 1,000 |

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