Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stockholders Equity Note [Line Items]
Beginning Balance	$ 316,100	$ 292,069
Net income (loss)	12,301	7,177
Foreign currency translation adjustment	2,101	(4,829)
Recognized net actuarial gain, net of tax provision	89	114
Total comprehensive income	14,491	2,462
Share-based compensation	871	994
Purchase of common shares	(1,795)	(3,678)
Issuance of common shares	279	397
Common shares distributed from/issued to rabbi trust	0	0
Cash dividends declared per share	(1,037)	(1,106)
Ending Balance	328,909	291,138
Common Shares [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	13,185	13,028
Issuance of common shares	117	127
Ending Balance	13,302	13,155
Common Shares Issued to Rabbi Trust [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	(10,102)	(10,940)
Common shares distributed from/issued to rabbi trust	(99)	120
Ending Balance	(10,201)	(10,820)
Deferred Compensation Liability [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	10,102	10,940
Common shares distributed from/issued to rabbi trust	99	(120)
Ending Balance	10,201	10,820
Paid In Capital [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	47,814	43,134
Share-based compensation	871	1,034
Issuance of common shares	162	270
Cash dividends declared per share		(116)
Ending Balance	48,847	44,322
Retained Earnings [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	410,673	379,035
Net income (loss)	12,285	7,179
Share-based compensation		(40)
Cash dividends declared per share	(1,037)	(990)
Ending Balance	421,921	385,184
Treasury Stock [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	(93,836)	(88,568)
Purchase of common shares	(1,795)	(3,678)
Ending Balance	(95,631)	(92,246)
Cumulative Translation Adjustment [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	(56,223)	(47,847)
Foreign currency translation adjustment	2,101	(4,829)
Ending Balance	(54,122)	(52,676)
Unrecognized Pension Benefit Cost [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	(5,496)	(6,704)
Recognized net actuarial gain, net of tax provision	89	114
Ending Balance	(5,407)	(6,590)
Total Preformed Line Products, Company Equity [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	316,117	292,078
Net income (loss)	12,285	7,179
Foreign currency translation adjustment	2,101	(4,829)
Recognized net actuarial gain, net of tax provision	89	114
Total comprehensive income	14,475	2,464
Share-based compensation	871	994
Purchase of common shares	(1,795)	(3,678)
Issuance of common shares	279	397
Common shares distributed from/issued to rabbi trust	0	0
Cash dividends declared per share	(1,037)	(1,106)
Ending Balance	328,910	291,149
Noncontrolling Interests [Member]
Stockholders Equity Note [Line Items]
Beginning Balance	(17)	(9)
Net income (loss)	16	(2)
Total comprehensive income	16	(2)
Ending Balance	$ (1)	$ (11)