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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | $ 264,156 | $ 251,500 | $ 268,568 | $ 257,813 | $ 250,203 | $ 249,370 | $ 268,568 | $ 249,370
Net income | 12,962 | 10,488 | 3,653 | 8,044 | 7,865 | 1,824 | 27,103 | 17,733
Foreign currency translation adjustment | 2,949 | 5,472 | (16,881) | (5,897) | 1,100 | 1,353 | (8,460) | (3,444)
Recognized net actuarial gain, net of tax provision | 75 | 91 | 98 | 108 | 93 | 93 | 264 | 294
Total comprehensive income | 15,986 | 16,051 | (13,130) | 2,255 | 9,058 | 3,270 |  |
Share-based compensation | 1,458 | 586 | 933 | 1,345 | 985 | 892 |  |
Purchase of common shares | (1,223) | (3,011) | (3,980) | (751) | (1,456) | (2,294) |  |
Issuance of common shares | 214 | 26 | 155 | 57 | 27 | 141 |  |
Common shares issued to rabbi trust | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends declared per share | (1,013) | (996) | (1,046) | (1,002) | (1,004) | (1,176) |  |
Ending Balance | 279,578 | 264,156 | 251,500 | 259,717 | 257,813 | 250,203 | 279,578 | 259,717
Common Shares [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 13,003 | 13,003 | 12,848 | 12,822 | 12,821 | 12,662 | 12,848 | 12,662
Issuance of common shares | 10 |  | 155 | 3 | 1 | 159 |  |
Ending Balance | 13,013 | 13,003 | 13,003 | 12,825 | 12,822 | 12,821 | 13,013 | 12,825
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (10,910) | (10,880) | (10,981) | (11,066) | (11,038) | (11,008) | (10,981) | (11,008)
Common shares issued to rabbi trust | (30) | (30) | 101 | 85 | (28) | (30) |  |
Ending Balance | (10,940) | (10,910) | (10,880) | (10,981) | (11,066) | (11,038) | (10,940) | (10,981)
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 10,910 | 10,880 | 10,981 | 11,066 | 11,038 | 11,008 | 10,981 | 11,008
Common shares issued to rabbi trust | 30 | 30 | (101) | (85) | 28 | 30 |  |
Ending Balance | 10,940 | 10,910 | 10,880 | 10,981 | 11,066 | 11,038 | 10,940 | 10,981
Paid In Capital [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 40,385 | 39,747 | 38,854 | 36,200 | 35,146 | 34,401 | 38,854 | 34,401
Share-based compensation | 1,458 | 612 | 976 | 1,388 | 1,028 | 928 |  |
Issuance of common shares | 204 | 26 |  | 54 | 26 | (18) |  |
Cash dividends declared per share |  |  | (83) |  |  | (165) |  |
Ending Balance | 42,047 | 40,385 | 39,747 | 37,642 | 36,200 | 35,146 | 42,047 | 37,642
Retained Earnings [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 365,443 | 355,984 | 353,292 | 341,804 | 334,947 | 334,170 | 353,292 | 334,170
Net income | 12,954 | 10,481 | 3,698 | 7,951 | 7,904 | 1,824 |  |
Share-based compensation |  | (26) | (43) | (43) | (43) | (36) |  |
Cash dividends declared per share | (1,013) | (996) | (963) | (1,002) | (1,004) | (1,011) |  |
Ending Balance | 377,384 | 365,443 | 355,984 | 348,710 | 341,804 | 334,947 | 377,384 | 348,710
Treasury Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (86,097) | (83,086) | (79,106) | (76,030) | (74,574) | (72,280) | (79,106) | (72,280)
Purchase of common shares | (1,223) | (3,011) | (3,980) | (751) | (1,456) | (2,294) |  |
Ending Balance | (87,320) | (86,097) | (83,086) | (76,781) | (76,030) | (74,574) | (87,320) | (76,781)
Cumulative Translation Adjustment [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (63,091) | (68,563) | (51,682) | (51,257) | (52,357) | (53,710) | (51,682) | (53,710)
Foreign currency translation adjustment | 2,949 | 5,472 | (16,881) | (5,897) | 1,100 | 1,353 |  |
Ending Balance | (60,142) | (63,091) | (68,563) | (57,154) | (51,257) | (52,357) | (60,142) | (57,154)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (5,482) | (5,573) | (5,671) | (5,687) | (5,780) | (5,873) | (5,671) | (5,873)
Recognized net actuarial gain, net of tax provision | 75 | 91 | 98 | 108 | 93 | 93 |  |
Ending Balance | (5,407) | (5,482) | (5,573) | (5,579) | (5,687) | (5,780) | (5,407) | (5,579)
Total Preformed Line Products, Company Equity [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 264,161 | 251,512 | 268,535 | 257,852 | 250,203 | 249,370 | 268,535 | 249,370
Net income | 12,954 | 10,481 | 3,698 | 7,951 | 7,904 | 1,824 |  |
Foreign currency translation adjustment | 2,949 | 5,472 | (16,881) | (5,897) | 1,100 | 1,353 |  |
Recognized net actuarial gain, net of tax provision | 75 | 91 | 98 | 108 | 93 | 93 |  |
Total comprehensive income | 15,978 | 16,044 | (13,085) | 2,162 | 9,097 | 3,270 |  |
Share-based compensation | 1,458 | 586 | 933 | 1,345 | 985 | 892 |  |
Purchase of common shares | (1,223) | (3,011) | (3,980) | (751) | (1,456) | (2,294) |  |
Issuance of common shares | 214 | 26 | 155 | 57 | 27 | 141 |  |
Common shares issued to rabbi trust | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends declared per share | (1,013) | (996) | (1,046) | (1,002) | (1,004) | (1,176) |  |
Ending Balance | 279,575 | 264,161 | 251,512 | 259,663 | 257,852 | 250,203 | 279,575 | 259,663
Noncontrolling Interests [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (5) | (12) | 33 | (39) | 0 | 0 | 33 | 0
Net income | 8 | 7 | (45) | 93 | (39) |  |  |
Total comprehensive income | 8 | 7 | (45) | 93 | (39) | 0 |  |
Ending Balance | $ 3 | $ (5) | $ (12) | $ 54 | $ (39) | $ 0 | $ 3 | $ 54

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