Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 Facility Segment State	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Number of quarries distribution facilities and plants	400
Number of states with aggregates business sales by destination	32
Number of reportable segments	3
Aggregates Product Line | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	58.00%
Aggregates-Related Downstream Product Lines | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	25.00%
Cement | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage		8.00%
Magnesia Specialties | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage		9.00%