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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reconciliations of total equity        
Beginning Balance $ 1,050,516 $ 898,261 $ 988,365 $ 892,496
Issuance of common stock under stock option plan   2,443 1,087 2,835
Purchase of common stock (6,074)   (16,969) (13,753)
Stock-based and deferred compensation 3,030 1,899 6,320 6,058
Net income 36,923 33,342 120,837 96,724
Other comprehensive income (18,530) 9,467 (20,051) (26,577)
Cash dividends paid:        
Common stock (6,848) (6,176) (20,572) (18,547)
Ending Balance 1,059,017 939,236 1,059,017 939,236
Common Stock [Member]        
Reconciliations of total equity        
Beginning Balance 26,752 26,552 26,658 26,493
Issuance of common stock under stock option plan   40 17 47
Stock-based and deferred compensation 1 23 78 75
Cash dividends paid:        
Ending Balance 26,753 26,615 26,753 26,615
Additional Paid-in Capital [Member]        
Reconciliations of total equity        
Beginning Balance 213,969 198,947 206,716 193,135
Issuance of common stock under stock option plan   2,403 1,070 2,788
Stock-based and deferred compensation 3,046 2,613 9,229 8,040
Cash dividends paid:        
Ending Balance 217,015 203,963 217,015 203,963
Common Treasury Stock [Member]        
Reconciliations of total equity        
Beginning Balance (147,494) (129,212) (133,629) (114,139)
Purchase of common stock (6,074)   (16,969) (13,753)
Stock-based and deferred compensation (17) (737) (2,987) (2,057)
Cash dividends paid:        
Ending Balance (153,585) (129,949) (153,585) (129,949)
Accumulated Other Comprehensive Income (Loss) [Member]        
Reconciliations of total equity        
Beginning Balance (138,420) (172,203) (136,881) (136,170)
Other comprehensive income (18,533) 9,430 (20,072) (26,603)
Cash dividends paid:        
Ending Balance (156,953) (162,773) (156,953) (162,773)
Retained Earnings [Member]        
Reconciliations of total equity        
Beginning Balance 1,093,994 973,345 1,023,829 922,464
Net income 36,920 33,168 120,809 96,420
Cash dividends paid:        
Common stock (6,848) (6,176) (20,572) (18,547)
Ending Balance 1,124,066 1,000,337 1,124,066 1,000,337
Noncontrolling Interest [Member]        
Reconciliations of total equity        
Beginning Balance [1] 1,715 832 1,672 713
Net income [1] 3 174 28 304
Other comprehensive income [1] 3 37 21 26
Cash dividends paid:        
Ending Balance [1] $ 1,721 $ 1,043 $ 1,721 $ 1,043
[1] Reflects the noncontrolling interest in the Company’s China joint venture.