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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($)
$ 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
Stockholders Equity Note [Line Items]            
Beginning Balance $ 250,203 $ 249,370 $ 247,021 $ 238,537 $ 249,370 $ 238,537
Net income 7,904 1,824 6,735 5,528 9,728 12,263
Foreign currency translation adjustment 1,100 1,353 (13,367) 3,832 2,453 (9,535)
Recognized net actuarial gain, net of tax provision 93 93 92 91 186 183
Comprehensive income (loss) attributable to Preformed Line Products Company shareholders 9,097 3,270 (6,540) 9,451 12,367 2,911
Share-based compensation 985 892 878 781    
Purchase of common shares (1,456) (2,294) (981) (833)    
Issuance of common shares 27 141 158 94    
Common shares issued to rabbi trust 0 0 0 0    
Cash dividends declared per share (1,004) (1,176) (1,007) (1,009)    
Ending Balance 257,852 250,203 239,529 247,021 257,852 239,529
Common Shares [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 12,821 12,662 12,635 12,593 12,662 12,593
Issuance of common shares 1 159 4 42    
Ending Balance 12,822 12,821 12,639 12,635 12,822 12,639
Common Shares Issued to Rabbi Trust [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (11,038) (11,008) (11,849) (11,834) (11,008) (11,834)
Common shares issued to rabbi trust (28) (30) 861 (15)    
Ending Balance (11,066) (11,038) (10,988) (11,849) (11,066) (10,988)
Deferred Compensation Liability [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 11,038 11,008 11,849 11,834 11,008 11,834
Common shares issued to rabbi trust 28 30 (861) 15    
Ending Balance 11,066 11,038 10,988 11,849 11,066 10,988
Paid In Capital [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 35,146 34,401 30,576 29,734 34,401 29,734
Share-based compensation 1,028 928 927 790    
Issuance of common shares 26 (18) 154 52    
Cash dividends declared per share   (165)        
Ending Balance 36,200 35,146 31,657 30,576 36,200 31,657
Retained Earnings [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance 334,947 334,170 316,275 311,765 334,170 311,765
Net income 7,904 1,824 6,735 5,528    
Share-based compensation (43) (36) (49) (9)    
Cash dividends declared per share (1,004) (1,011) (1,007) (1,009)    
Ending Balance 341,804 334,947 321,954 316,275 341,804 321,954
Treasury Stock [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (74,574) (72,280) (68,948) (68,115) (72,280) (68,115)
Purchase of common shares (1,456) (2,294) (981) (833)    
Ending Balance (76,030) (74,574) (69,929) (68,948) (76,030) (69,929)
Cumulative Translation Adjustment [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (52,357) (53,710) (37,593) (41,425) (53,710) (41,425)
Foreign currency translation adjustment 1,100 1,353 (13,367) 3,832    
Ending Balance (51,257) (52,357) (50,960) (37,593) (51,257) (50,960)
Unrecognized Pension Benefit Cost [Member]            
Stockholders Equity Note [Line Items]            
Beginning Balance (5,780) (5,873) (5,924) (6,015) (5,873) (6,015)
Recognized net actuarial gain, net of tax provision 93 93 92 91    
Ending Balance $ (5,687) $ (5,780) $ (5,832) $ (5,924) $ (5,687) $ (5,832)