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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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