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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Stockholders Equity Note [Line Items]            
Beginning Balance $ 291,138 $ 292,069 $ 251,500 $ 268,568 $ 292,069 $ 268,568
Net income (loss) 8,891 7,177 10,488 3,653 16,068 14,141
Foreign currency translation adjustment 4,311 (4,829) 5,472 (16,881) (518) (11,409)
Recognized net actuarial gain, net of tax provision 113 114 91 98 227 189
Total comprehensive income 13,315 2,462 16,051 (13,130)    
Share-based compensation 853 994 586 933    
Purchase of common shares (1,046) (3,678) (3,011) (3,980)    
Issuance of common shares 364 397 26 155    
Common shares distributed from rabbi trust 0 0 0 0    
Cash dividends declared per share (981) (1,106) (996) (1,046)    
Ending Balance 303,643 291,138 264,156 251,500 303,643 264,156
Common Shares [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 13,155 13,028 13,003 12,848 13,028 12,848
Issuance of common shares 15 127   155    
Ending Balance 13,170 13,155 13,003 13,003 13,170 13,003
Common Shares Issued to Rabbi Trust [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (10,820) (10,940) (10,880) (10,981) (10,940) (10,981)
Common shares distributed from rabbi trust (30) 120 (30) 101    
Ending Balance (10,850) (10,820) (10,910) (10,880) (10,850) (10,910)
Deferred Compensation Liability [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 10,820 10,940 10,880 10,981 10,940 10,981
Common shares distributed from rabbi trust 30 (120) 30 (101)    
Ending Balance 10,850 10,820 10,910 10,880 10,850 10,910
Paid In Capital [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 44,322 43,134 39,747 38,854 43,134 38,854
Share-based compensation 893 1,034 612 976    
Issuance of common shares 349 270 26      
Cash dividends declared per share   (116)   (83)    
Ending Balance 45,564 44,322 40,385 39,747 45,564 40,385
Retained Earnings [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 385,184 379,035 355,984 353,292 379,035 353,292
Net income (loss) 8,869 7,179 10,481 3,698    
Share-based compensation (40) (40) (26) (43)    
Cash dividends declared per share (981) (990) (996) (963)    
Ending Balance 393,032 385,184 365,443 355,984 393,032 365,443
Treasury Stock [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (92,246) (88,568) (83,086) (79,106) (88,568) (79,106)
Purchase of common shares (1,046) (3,678) (3,011) (3,980)    
Ending Balance (93,292) (92,246) (86,097) (83,086) (93,292) (86,097)
Cumulative Translation Adjustment [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (52,676) (47,847) (68,563) (51,682) (47,847) (51,682)
Foreign currency translation adjustment 4,311 (4,829) 5,472 (16,881)    
Ending Balance (48,365) (52,676) (63,091) (68,563) (48,365) (63,091)
Unrecognized Pension Benefit Cost [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (6,590) (6,704) (5,573) (5,671) (6,704) (5,671)
Recognized net actuarial gain, net of tax provision 113 114 91 98    
Ending Balance (6,477) (6,590) (5,482) (5,573) (6,477) (5,482)
Total Preformed Line Products, Company Equity [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 291,149 292,078 251,512 268,535 292,078 268,535
Net income (loss) 8,869 7,179 10,481 3,698    
Foreign currency translation adjustment 4,311 (4,829) 5,472 (16,881)    
Recognized net actuarial gain, net of tax provision 113 114 91 98    
Total comprehensive income 13,293 2,464 16,044 (13,085)    
Share-based compensation 853 994 586 933    
Purchase of common shares (1,046) (3,678) (3,011) (3,980)    
Issuance of common shares 364 397 26 155    
Common shares distributed from rabbi trust 0 0 0 0    
Cash dividends declared per share (981) (1,106) (996) (1,046)    
Ending Balance 303,632 291,149 264,161 251,512 303,632 264,161
Noncontrolling Interests [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (11) (9) (12) 33 (9) 33
Net income (loss) 22 (2) 7 (45)    
Total comprehensive income 22 (2) 7 (45)    
Ending Balance $ 11 $ (11) $ (5) $ (12) $ 11 $ (5)