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Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2019 USD ($) Location Facility Terminal Plant Sector Segment JointVentures
Segment Reporting Information [Line Items]
Number of sectors \| Sector	3
Number of reportable business segments \| Segment	5
Cement plant locations \| Location	7
Slag grinding facility \| Facility	1
Cement distribution terminals \| Terminal	19
Gypsum wallboard plants \| Plant	5
Readymix concrete batch plants \| Plant	17
Aggregates processing plants \| Plant	4
Number of frac sand processing facilities \| Facility	2
Number of frac sand drying facilities \| Facility	4
Number of frac sand trans-load locations \| Location	5
Proportionate consolidation of share of Joint Venture's revenues and operating earnings	50.00%
Accrued capital expenditures \| $	$ 3.7
Cement [Member]
Segment Reporting Information [Line Items]
Number of Joint Venture \| JointVentures	1