Pension and other Post-Employment Benefits - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) Location Pension_Plan Plan Payment	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020
Fairmount Santrol [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans	2
CANADA [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans	3
Number of post-retirement medical plans	2
CANADA [Member] | Hourly Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans	2
CANADA [Member] | Salaried Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans	1
MEXICO [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans | Plan	4
Number of annual payments | Payment	5
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of unionized locations | Location	3
Seniority Premium Plan [Member] | MEXICO [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retirement plans | Plan	2
Assumptions for Covia Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.35%			3.15%
Covia Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $	$ 1.3	$ 0.3
Covia Pension Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions | $			$ 4.0