COVID-19 (Details)	Dec. 31, 2022	Dec. 31, 2021
COVID-19 [Member] \| Plan [Member]
COVID-19 [Abstract]
Percentage of employer payroll taxes due	50.00%	50.00%

Percentage of employer payroll taxes due on a delayed basis under the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act").

No definition available.

Name:	mtx_PercentageOfEmployerPayrollTaxesDue
Namespace Prefix:	mtx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant