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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stockholders Equity Note [Line Items]    
Beginning Balance $ 292,069 $ 268,568
Net income (loss) 7,177 3,653
Foreign currency translation adjustment (4,829) (16,881)
Recognized net actuarial gain, net of tax provision 114 98
Total comprehensive income 2,462 (13,130)
Share-based compensation 994 933
Purchase of common shares (3,678) (3,980)
Issuance of common shares 397 155
Common shares distributed from rabbi trust 0 0
Cash dividends declared per share (1,106) (1,046)
Ending Balance 291,138 251,500
Common Shares [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 13,028 12,848
Issuance of common shares 127 155
Ending Balance 13,155 13,003
Common Shares Issued to Rabbi Trust [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (10,940) (10,981)
Common shares distributed from rabbi trust 120 101
Ending Balance (10,820) (10,880)
Deferred Compensation Liability [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 10,940 10,981
Common shares distributed from rabbi trust (120) (101)
Ending Balance 10,820 10,880
Paid In Capital [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 43,134 38,854
Share-based compensation 1,034 976
Issuance of common shares 270  
Cash dividends declared per share (116) (83)
Ending Balance 44,322 39,747
Retained Earnings [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 379,035 353,292
Net income (loss) 7,179 3,698
Share-based compensation (40) (43)
Cash dividends declared per share (990) (963)
Ending Balance 385,184 355,984
Treasury Stock [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (88,568) (79,106)
Purchase of common shares (3,678) (3,980)
Ending Balance (92,246) (83,086)
Cumulative Translation Adjustment [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (47,847) (51,682)
Foreign currency translation adjustment (4,829) (16,881)
Ending Balance (52,676) (68,563)
Unrecognized Pension Benefit Cost [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (6,704) (5,671)
Recognized net actuarial gain, net of tax provision 114 98
Ending Balance (6,590) (5,573)
Total Preformed Line Products, Company Equity [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 292,078 268,535
Net income (loss) 7,179 3,698
Foreign currency translation adjustment (4,829) (16,881)
Recognized net actuarial gain, net of tax provision 114 98
Total comprehensive income 2,464 (13,085)
Share-based compensation 994 933
Purchase of common shares (3,678) (3,980)
Issuance of common shares 397 155
Common shares distributed from rabbi trust 0 0
Cash dividends declared per share (1,106) (1,046)
Ending Balance 291,149 251,512
Noncontrolling Interests [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (9) 33
Net income (loss) (2) (45)
Total comprehensive income (2) (45)
Ending Balance $ (11) $ (12)