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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders Equity Note [Line Items]                
Beginning Balance $ 303,643 $ 291,138 $ 292,069 $ 264,156 $ 251,500 $ 268,568 $ 292,069 $ 268,568
Net income (loss) 10,703 8,891 7,177 12,962 10,488 3,653 26,770 27,103
Foreign currency translation adjustment (5,504) 4,311 (4,829) 2,949 5,472 (16,881) (6,022) (8,460)
Recognized net actuarial gain, net of tax provision 125 113 114 75 91 98 352 264
Total comprehensive income 5,324 13,315 2,462 15,986 16,051 (13,130)    
Share-based compensation 1,324 853 994 1,458 586 933    
Purchase of common shares (544) (1,046) (3,678) (1,223) (3,011) (3,980)    
Issuance of common shares 29 364 397 214 26 155    
Common shares distributed from rabbi trust 0 0 0 0 0 0    
Cash dividends declared per share (980) (981) (1,106) (1,013) (996) (1,046)    
Ending Balance 308,796 303,643 291,138 279,578 264,156 251,500 308,796 279,578
Common Shares [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 13,170 13,155 13,028 13,003 13,003 12,848 13,028 12,848
Issuance of common shares   15 127 10   155    
Ending Balance 13,171 13,170 13,155 13,013 13,003 13,003 13,171 13,013
Common Shares Issued to Rabbi Trust [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance (10,850) (10,820) (10,940) (10,910) (10,880) (10,981) (10,940) (10,981)
Common shares distributed from rabbi trust 748 (30) 120 (30) (30) 101    
Ending Balance (10,102) (10,850) (10,820) (10,940) (10,910) (10,880) (10,102) (10,940)
Deferred Compensation Liability [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 10,850 10,820 10,940 10,910 10,880 10,981 10,940 10,981
Common shares distributed from rabbi trust (748) 30 (120) 30 30 (101)    
Ending Balance 10,102 10,850 10,820 10,940 10,910 10,880 10,102 10,940
Paid In Capital [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 45,564 44,322 43,134 40,385 39,747 38,854 43,134 38,854
Share-based compensation 1,364 893 1,034 1,458 612 976    
Issuance of common shares 28 349 270 204 26      
Cash dividends declared per share     (116)     (83)    
Ending Balance 46,956 45,564 44,322 42,047 40,385 39,747 46,956 42,047
Retained Earnings [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 393,032 385,184 379,035 365,443 355,984 353,292 379,035 353,292
Net income (loss) 10,708 8,869 7,179 12,954 10,481 3,698    
Share-based compensation (40) (40) (40)   (26) (43)    
Cash dividends declared per share (980) (981) (990) (1,013) (996) (963)    
Ending Balance 402,720 393,032 385,184 377,384 365,443 355,984 402,720 377,384
Treasury Stock [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance (93,292) (92,246) (88,568) (86,097) (83,086) (79,106) (88,568) (79,106)
Purchase of common shares (544) (1,046) (3,678) (1,223) (3,011) (3,980)    
Ending Balance (93,836) (93,292) (92,246) (87,320) (86,097) (83,086) (93,836) (87,320)
Cumulative Translation Adjustment [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance (48,365) (52,676) (47,847) (63,091) (68,563) (51,682) (47,847) (51,682)
Foreign currency translation adjustment (5,504) 4,311 (4,829) 2,949 5,472 (16,881)    
Ending Balance (53,869) (48,365) (52,676) (60,142) (63,091) (68,563) (53,869) (60,142)
Unrecognized Pension Benefit Cost [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance (6,477) (6,590) (6,704) (5,482) (5,573) (5,671) (6,704) (5,671)
Recognized net actuarial gain, net of tax provision 125 113 114 75 91 98    
Ending Balance (6,352) (6,477) (6,590) (5,407) (5,482) (5,573) (6,352) (5,407)
Total Preformed Line Products, Company Equity [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 303,632 291,149 292,078 264,161 251,512 268,535 292,078 268,535
Net income (loss) 10,708 8,869 7,179 12,954 10,481 3,698    
Foreign currency translation adjustment (5,504) 4,311 (4,829) 2,949 5,472 (16,881)    
Recognized net actuarial gain, net of tax provision 125 113 114 75 91 98    
Total comprehensive income 5,329 13,293 2,464 15,978 16,044 (13,085)    
Share-based compensation 1,324 853 994 1,458 586 933    
Purchase of common shares (544) (1,046) (3,678) (1,223) (3,011) (3,980)    
Issuance of common shares 29 364 397 214 26 155    
Common shares distributed from rabbi trust 0 0 0 0 0 0    
Cash dividends declared per share (980) (981) (1,106) (1,013) (996) (1,046)    
Ending Balance 308,790 303,632 291,149 279,575 264,161 251,512 308,790 279,575
Noncontrolling Interests [Member]                
Stockholders Equity Note [Line Items]                
Beginning Balance 11 (11) (9) (5) (12) 33 (9) 33
Net income (loss) (5) 22 (2) 8 7 (45)    
Total comprehensive income (5) 22 (2) 8 7 (45)    
Ending Balance $ 6 $ 11 $ (11) $ 3 $ (5) $ (12) $ 6 $ 3