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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income attributable to Preformed Line Products Company Shareholders	$ 7,904	$ 1,824	$ 6,735	$ 5,528	$ 9,728	$ 12,263
Determination of shares
Weighted-average common shares outstanding	5,049		5,044		5,047	5,045
Dilutive effect - share-based awards	9		20		9	19
Diluted weighted-average common shares outstanding	5,058		5,064		5,056	5,064
Earnings per common share
Basic	$ 1.57		$ 1.34		$ 1.93	$ 2.43
Diluted	$ 1.56		$ 1.33		$ 1.92	$ 2.42

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