Restructuring Costs - Summary of Reconciliation of Restructuring Expense by Segment (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 500,000	$ 400,000	$ 800,000	$ 900,000	$ 900,000	$ 1,700,000
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	500,000	$ 400,000	800,000	$ 900,000	900,000	1,700,000
Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	500,000		800,000		900,000	1,700,000
Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	100,000		400,000		100,000	1,000,000.0
Operating Segments [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	400,000		400,000		800,000	700,000
Operating Segments [Member] | 2019 Altra Plan [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	100,000		400,000		100,000	1,000,000.0
Operating Segments [Member] | 2019 Altra Plan [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 400,000		$ 400,000		$ 800,000	$ 700,000