Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reconciliations of total equity
Beginning Balance		$ 1,125,711	$ 1,050,516	$ 1,074,193	$ 988,365
Issuance of common stock under stock option plan		169		353	1,087
Purchase of common stock		(5,281)	(6,074)	(22,257)	(16,969)
Stock-based and deferred compensation		3,300	3,030	10,226	6,320
Net income		39,384	36,923	136,319	120,837
Other comprehensive income (loss)		(25,571)	(18,530)	(46,137)	(20,051)
Cash dividends paid:
Common stock		(7,473)	(6,848)	(22,458)	(20,572)
Ending Balance		1,130,239	1,059,017	1,130,239	1,059,017
Common Stock [Member]
Reconciliations of total equity
Beginning Balance		26,825	26,752	26,761	26,658
Issuance of common stock under stock option plan		3		5	17
Stock-based and deferred compensation		1	1	63	78
Cash dividends paid:
Ending Balance		26,829	26,753	26,829	26,753
Additional Paid-in Capital [Member]
Reconciliations of total equity
Beginning Balance		229,510	213,969	220,820	206,716
Issuance of common stock under stock option plan		166		348	1,070
Stock-based and deferred compensation		3,360	3,046	11,868	9,229
Cash dividends paid:
Ending Balance		233,036	217,015	233,036	217,015
Common Treasury Stock [Member]
Reconciliations of total equity
Beginning Balance		(172,322)	(147,494)	(153,702)	(133,629)
Purchase of common stock		(5,281)	(6,074)	(22,257)	(16,969)
Stock-based and deferred compensation		(61)	(17)	(1,705)	(2,987)
Cash dividends paid:
Ending Balance		(177,664)	(153,585)	(177,664)	(153,585)
Accumulated Other Comprehensive Income (Loss) [Member]
Reconciliations of total equity
Beginning Balance		(173,802)	(138,420)	(153,236)	(136,881)
Other comprehensive income (loss)		(25,571)	(18,533)	(46,137)	(20,072)
Cash dividends paid:
Ending Balance		(199,373)	(156,953)	(199,373)	(156,953)
Retained Earnings [Member]
Reconciliations of total equity
Beginning Balance		1,215,500	1,093,994	1,133,550	1,023,829
Net income		39,384	36,920	136,319	120,809
Cash dividends paid:
Common stock		(7,473)	(6,848)	(22,458)	(20,572)
Ending Balance		$ 1,247,411	1,124,066	$ 1,247,411	1,124,066
Noncontrolling Interest [Member]
Reconciliations of total equity
Beginning Balance	[1]		1,715		1,672
Net income	[1]		3		28
Other comprehensive income (loss)	[1]		3		21
Cash dividends paid:
Ending Balance	[1]		$ 1,721		$ 1,721

[1] Reflects the prior year noncontrolling interest in the Company’s China joint venture which was dissolved in the fourth quarter of 2021.