Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reconciliations of total equity
Beginning Balance		$ 1,116,738	$ 1,003,946	$ 1,074,193	$ 988,365
Issuance of common stock under stock option plan		71	706	185	1,087
Purchase of common stock		(7,041)	(9,906)	(16,976)	(10,895)
Stock-based and deferred compensation		4,908	3,282	6,925	3,290
Net income		52,126	43,303	96,935	83,914
Other comprehensive income (loss)		(33,619)	16,048	(20,566)	(1,521)
Cash dividends paid:
Common stock		(7,472)	(6,863)	(14,985)	(13,724)
Ending Balance		1,125,711	1,050,516	1,125,711	1,050,516
Common Stock [Member]
Reconciliations of total equity
Beginning Balance		26,814	26,726	26,761	26,658
Issuance of common stock under stock option plan		1	11	3	17
Stock-based and deferred compensation		10	15	61	77
Cash dividends paid:
Ending Balance		26,825	26,752	26,825	26,752
Additional Paid-in Capital [Member]
Reconciliations of total equity
Beginning Balance		224,500	209,471	220,820	206,716
Issuance of common stock under stock option plan		70	695	182	1,070
Stock-based and deferred compensation		4,940	3,803	8,508	6,183
Cash dividends paid:
Ending Balance		229,510	213,969	229,510	213,969
Common Treasury Stock [Member]
Reconciliations of total equity
Beginning Balance		(165,239)	(137,052)	(153,702)	(133,629)
Purchase of common stock		(7,041)	(9,906)	(16,976)	(10,895)
Stock-based and deferred compensation		(42)	(536)	(1,644)	(2,970)
Cash dividends paid:
Ending Balance		(172,322)	(147,494)	(172,322)	(147,494)
Accumulated Other Comprehensive Income (Loss) [Member]
Reconciliations of total equity
Beginning Balance		(140,183)	(154,442)	(153,236)	(136,881)
Other comprehensive income (loss)		(33,619)	16,022	(20,566)	(1,539)
Cash dividends paid:
Ending Balance		(173,802)	(138,420)	(173,802)	(138,420)
Retained Earnings [Member]
Reconciliations of total equity
Beginning Balance		1,170,846	1,057,579	1,133,550	1,023,829
Net income		52,126	43,278	96,935	83,889
Cash dividends paid:
Common stock		(7,472)	(6,863)	(14,985)	(13,724)
Ending Balance		$ 1,215,500	1,093,994	$ 1,215,500	1,093,994
Noncontrolling Interest [Member]
Reconciliations of total equity
Beginning Balance	[1]		1,664		1,672
Net income	[1]		25		25
Other comprehensive income (loss)	[1]		26		18
Cash dividends paid:
Ending Balance	[1]		$ 1,715		$ 1,715

[1] Reflects the noncontrolling interest in the Company’s China joint venture.