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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)

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