Restructuring Costs - Summary of Reconciliation of Restructuring Expense by Segment (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 400,000	$ 900,000
2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	0
2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	400,000	900,000
Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	400,000	900,000
Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense		600,000
Operating Segments [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	400,000	300,000
Operating Segments [Member] | 2019 Altra Plan [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense		600,000
Operating Segments [Member] | 2019 Altra Plan [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 400,000	$ 300,000