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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | $ 257,813 | $ 250,203 | $ 249,370 | $ 239,529 | $ 247,021 | $ 238,537 | $ 249,370 | $ 238,537
Net income | 8,044 | 7,865 | 1,824 | 9,054 | 6,735 | 5,528 | 17,733 | 21,318
Foreign currency translation adjustment | (5,897) | 1,100 | 1,353 | (563) | (13,367) | 3,832 | (3,444) | (10,098)
Recognized net actuarial gain, net of tax provision | 108 | 93 | 93 | 116 | 92 | 91 | 294 | 299
Total comprehensive income | 2,255 | 9,058 | 3,270 | 8,607 | (6,540) | 9,451 |  |
Share-based compensation | 1,345 | 985 | 892 | 1,404 | 1,945 | 781 |  |
Purchase of common shares | (751) | (1,456) | (2,294) | (2,313) | (981) | (833) |  |
Issuance of common shares | 57 | 27 | 141 | 210 | 4 | 94 |  |
Common shares issued to rabbi trust | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends declared per share | (1,002) | (1,004) | (1,176) | (1,032) | (1,920) | (1,009) |  |
Ending Balance | 259,717 | 257,813 | 250,203 | 246,405 | 239,529 | 247,021 | 259,717 | 246,405
Common Shares [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 12,822 | 12,821 | 12,662 | 12,639 | 12,635 | 12,593 | 12,662 | 12,593
Issuance of common shares | 3 | 1 | 159 | 4 | 4 | 42 |  |
Ending Balance | 12,825 | 12,822 | 12,821 | 12,643 | 12,639 | 12,635 | 12,825 | 12,643
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (11,066) | (11,038) | (11,008) | (10,988) | (11,849) | (11,834) | (11,008) | (11,834)
Common shares issued to rabbi trust | 85 | (28) | (30) | (20) | 861 | (15) |  |
Ending Balance | (10,981) | (11,066) | (11,038) | (11,008) | (10,988) | (11,849) | (10,981) | (11,008)
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 11,066 | 11,038 | 11,008 | 10,988 | 11,849 | 11,834 | 11,008 | 11,834
Common shares issued to rabbi trust | (85) | 28 | 30 | 20 | (861) | 15 |  |
Ending Balance | 10,981 | 11,066 | 11,038 | 11,008 | 10,988 | 11,849 | 10,981 | 11,008
Paid In Capital [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 36,200 | 35,146 | 34,401 | 31,657 | 30,576 | 29,734 | 34,401 | 29,734
Share-based compensation | 1,388 | 1,028 | 928 | 1,421 | 1,994 | 790 |  |
Issuance of common shares | 54 | 26 | (18) | 206 |  | 52 |  |
Cash dividends declared per share |  |  | (165) |  | (913) |  |  |
Ending Balance | 37,642 | 36,200 | 35,146 | 33,284 | 31,657 | 30,576 | 37,642 | 33,284
Retained Earnings [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 341,804 | 334,947 | 334,170 | 321,954 | 316,275 | 311,765 | 334,170 | 311,765
Net income | 7,951 | 7,904 | 1,824 | 9,054 | 6,735 | 5,528 |  |
Share-based compensation | (43) | (43) | (36) | (17) | (49) | (9) |  |
Cash dividends declared per share | (1,002) | (1,004) | (1,011) | (1,032) | (1,007) | (1,009) |  |
Ending Balance | 348,710 | 341,804 | 334,947 | 329,959 | 321,954 | 316,275 | 348,710 | 329,959
Treasury Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (76,030) | (74,574) | (72,280) | (69,929) | (68,948) | (68,115) | (72,280) | (68,115)
Purchase of common shares | (751) | (1,456) | (2,294) | (2,313) | (981) | (833) |  |
Ending Balance | (76,781) | (76,030) | (74,574) | (72,242) | (69,929) | (68,948) | (76,781) | (72,242)
Cumulative Translation Adjustment [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (51,257) | (52,357) | (53,710) | (50,960) | (37,593) | (41,425) | (53,710) | (41,425)
Foreign currency translation adjustment | (5,897) | 1,100 | 1,353 | (563) | (13,367) | 3,832 |  |
Ending Balance | (57,154) | (51,257) | (52,357) | (51,523) | (50,960) | (37,593) | (57,154) | (51,523)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (5,687) | (5,780) | (5,873) | (5,832) | (5,924) | (6,015) | (5,873) | (6,015)
Recognized net actuarial gain, net of tax provision | 108 | 93 | 93 | 116 | 92 | 91 |  |
Ending Balance | (5,579) | (5,687) | (5,780) | $ (5,716) | $ (5,832) | $ (5,924) | (5,579) | $ (5,716)
Total Preformed Line Products, Company Equity [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 257,852 | 250,203 | 249,370 |  |  |  | 249,370 |
Net income | 7,951 | 7,904 | 1,824 |  |  |  |  |
Foreign currency translation adjustment | (5,897) | 1,100 | 1,353 |  |  |  |  |
Recognized net actuarial gain, net of tax provision | 108 | 93 | 93 |  |  |  |  |
Total comprehensive income | 2,162 | 9,097 | 3,270 |  |  |  |  |
Share-based compensation | 1,345 | 985 | 892 |  |  |  |  |
Purchase of common shares | (751) | (1,456) | (2,294) |  |  |  |  |
Issuance of common shares | 57 | 27 | 141 |  |  |  |  |
Common shares issued to rabbi trust | 0 | 0 | 0 |  |  |  |  |
Cash dividends declared per share | (1,002) | (1,004) | (1,176) |  |  |  |  |
Ending Balance | 259,663 | 257,852 | 250,203 |  |  |  | 259,663 |
Noncontrolling Interests [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | (39) | 0 | 0 |  |  |  | 0 |
Net income | 93 | (39) |  |  |  |  |  |
Total comprehensive income | 93 | (39) |  |  |  |  |  |
Ending Balance | $ 54 | $ (39) | $ 0 |  |  |  | $ 54 |

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