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Shareholders Equity - Summary of Changes in Shareholders Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders Equity Note [Line Items]    
Beginning Balance $ 249,370 $ 238,537
Net income 1,824 5,528
Foreign currency translation adjustment 1,353 3,832
Recognized net actuarial gain, net of tax provision 93 91
Comprehensive income 3,270 9,451
Share-based compensation 892 781
Purchase of common shares (2,294) (833)
Issuance of common shares 141 94
Common shares issued to rabbi trust 0 0
Cash dividends declared per share (1,176) (1,009)
Ending Balance 250,203 247,021
Common Shares [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 12,662 12,593
Issuance of common shares 159 42
Ending Balance 12,821 12,635
Common Shares Issued to Rabbi Trust [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (11,008) (11,834)
Common shares issued to rabbi trust (30) (15)
Ending Balance (11,038) (11,849)
Deferred Compensation Liability [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 11,008 11,834
Common shares issued to rabbi trust 30 15
Ending Balance 11,038 11,849
Paid In Capital [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 34,401 29,734
Share-based compensation 928 790
Issuance of common shares (18) 52
Cash dividends declared per share (165)  
Ending Balance 35,146 30,576
Retained Earnings [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance 334,170 311,765
Net income 1,824 5,528
Share-based compensation (36) (9)
Cash dividends declared per share (1,011) (1,009)
Ending Balance 334,947 316,275
Treasury Stock [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (72,280) (68,115)
Purchase of common shares (2,294) (833)
Ending Balance (74,574) (68,948)
Cumulative Translation Adjustment [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (53,710) (41,425)
Foreign currency translation adjustment 1,353 3,832
Ending Balance (52,357) (37,593)
Unrecognized Pension Benefit Cost [Member]    
Stockholders Equity Note [Line Items]    
Beginning Balance (5,873) (6,015)
Recognized net actuarial gain, net of tax provision 93 91
Ending Balance $ (5,780) $ (5,924)