Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Facility State Plant shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of states with aggregates business sales by destination | State	27
Number of cement plants | Plant	2
Number of asphalt plants | Plant	7
Out of period expenses	$ 15.7
Retirement plans and postretirement benefits amortized amount representing percentage of greater of projected benefit obligation or pension plan assets.	10.00%
Minimum likelihood for recognition of tax benefit related to uncertain tax position	50.00%
Operating lease, right of use asset	$ 481.9
Operating lease, liability	486.6
Finance leases, right of use asset	18.3
Finance leases, liability	$ 8.7
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease, right of use asset				$ 502.5
Operating lease, liability				501.6
Finance leases, right of use asset				10.9
Finance leases, liability				$ 12.1
Stock Options
Significant Accounting Policies [Line Items]
Stock options issued | shares	0	0	0
Expendable Parts Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	5 years
Supplies Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	1 year
Minimum
Significant Accounting Policies [Line Items]
Number of quarries and yards | Facility	300
Number of ready mixed concrete plants | Plant	141
Minimum | Inventory Finished Goods
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	12 months
Maximum
Significant Accounting Policies [Line Items]
Warranty term	1 year
Maximum | Inventory Finished Goods
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	5 years
Percentage of Aggregates Business Net Sales in Top Five Sales states | Geographic Concentration Risk | Sales Revenue Segment
Significant Accounting Policies [Line Items]
Total net sales, percentage	72.00%