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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reconciliations of total equity        
Beginning Balance $ 1,003,946 $ 867,472 $ 988,365 $ 892,496
Issuance of common stock under stock option plan 706 237 1,087 392
Purchase of common stock (9,906) (6,510) (10,895) (13,753)
Stock-based and deferred compensation 3,282 3,043 3,290 4,159
Net income 43,303 35,843 83,914 63,382
Other comprehensive income 16,048 4,345 (1,521) (36,044)
Cash dividends paid:        
Common stock (6,863) (6,169) (13,724) (12,371)
Ending Balance 1,050,516 898,261 1,050,516 898,261
Common Stock [Member]        
Reconciliations of total equity        
Beginning Balance 26,726 26,541 26,658 26,493
Issuance of common stock under stock option plan 11 4 17 7
Stock-based and deferred compensation 15 7 77 52
Cash dividends paid:        
Ending Balance 26,752 26,552 26,752 26,552
Additional Paid-in Capital [Member]        
Reconciliations of total equity        
Beginning Balance 209,471 195,661 206,716 193,135
Issuance of common stock under stock option plan 695 233 1,070 385
Stock-based and deferred compensation 3,803 3,053 6,183 5,427
Cash dividends paid:        
Ending Balance 213,969 198,947 213,969 198,947
Common Treasury Stock [Member]        
Reconciliations of total equity        
Beginning Balance (137,052) (122,685) (133,629) (114,139)
Purchase of common stock (9,906) (6,510) (10,895) (13,753)
Stock-based and deferred compensation (536) (17) (2,970) (1,320)
Cash dividends paid:        
Ending Balance (147,494) (129,212) (147,494) (129,212)
Accumulated Other Comprehensive Income (Loss) [Member]        
Reconciliations of total equity        
Beginning Balance (154,442) (176,546) (136,881) (136,170)
Other comprehensive income 16,022 4,343 (1,539) (36,033)
Cash dividends paid:        
Ending Balance (138,420) (172,203) (138,420) (172,203)
Retained Earnings [Member]        
Reconciliations of total equity        
Beginning Balance 1,057,579 943,807 1,023,829 922,464
Net income 43,278 35,707 83,889 63,252
Cash dividends paid:        
Common stock (6,863) (6,169) (13,724) (12,371)
Ending Balance 1,093,994 973,345 1,093,994 973,345
Noncontrolling Interest [Member]        
Reconciliations of total equity        
Beginning Balance [1] 1,664 694 1,672 713
Net income [1] 25 136 25 130
Other comprehensive income [1] 26 2 18 (11)
Cash dividends paid:        
Ending Balance [1] $ 1,715 $ 832 $ 1,715 $ 832
[1] Reflects the noncontrolling interest in the Company’s China joint venture.