Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Payments of ordinary dividends, noncontrolling interest	$ 3,718	$ 2,175	$ 0
Proceeds from sale of inventory to related parties	9,600
Unconsolidated Majority-Owned Subsidiary | Apergy Middle East Services LLC
Related Party Transaction [Line Items]
Payments of ordinary dividends, noncontrolling interest	1,600	$ 2,200	$ 0
Unconsolidated Majority-Owned Subsidiary | Champion Arabia Co Ltd
Related Party Transaction [Line Items]
Payments of ordinary dividends, noncontrolling interest	1,600
Unconsolidated Majority-Owned Subsidiary | Petrochem Performance Products
Related Party Transaction [Line Items]
Payments of ordinary dividends, noncontrolling interest	$ 500