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Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Apr. 17, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Subsequent Event [Line Items]
Assets		$ 2,961,020				$ 2,169,163				$ 2,961,020	$ 2,169,163	$ 2,368,003
Liabilities		1,993,177				959,676				1,993,177	959,676
Revenue		315,442	$ 350,249	$ 414,526	$ 370,597	$ 284,701	$ 333,285	$ 381,499	$ 393,756	1,450,814	1,393,241	1,386,520
Mathews Readymix LLC and Western Aggregates LLC [Member]
Subsequent Event [Line Items]
Assets		43,700								43,700
Liabilities		$ 2,300								2,300
Revenue										$ 32,300	$ 27,800	$ 27,700
Mathews Readymix LLC and Western Aggregates LLC [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Purcahse price of acquisition	$ 93,500

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