Segment Information - Schedule Of Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Sales to external customers	$ 313,318	$ 273,746	$ 287,011	$ 256,708	$ 311,188	$ 275,159	$ 282,493	$ 265,045	$ 1,130,783	$ 1,133,885	$ 1,112,058
Intercompany sales									0	0	0
Net income:
Continuing operations	20,840	15,712	23,722	9,316	33,119	18,674	22,132	13,522	69,590	87,447	85,858
Discontinued operations	11	$ 264	$ 576	$ 366	(432)	$ 631	$ 356	$ 504	1,217	1,059	2,389
Total assets	1,424,818				1,264,792				1,424,818	1,264,792	1,234,270
Interest income									1,525	1,822	1,142
Interest expense									10,854	9,851	10,677
Noncash items:
Depreciation and amortization									31,684	29,921	30,764
Pension expense									(11,955)	(4,836)	(12,268)
Income tax provision									44,407	41,044	35,145
Capital expenditures									36,241	33,583	36,517
Net property	155,839				151,352				155,839	151,352	152,755
North America
Segment Reporting Information [Line Items]
Sales to external customers									608,983	547,739	533,161
Intercompany sales									133,355	116,795	120,952
Net income:
Continuing operations									87,092	77,687	68,181
Discontinued operations									0	0	0
Total assets	820,960				819,095				820,960	819,095	764,411
Interest income									619	995	243
Interest expense									0	0	0
Noncash items:
Depreciation and amortization									20,048	18,635	19,639
Pension expense									(3,759)	1,977	(4,765)
Income tax provision									45,849	40,919	34,347
Capital expenditures									20,071	18,377	17,887
Net property	89,418				86,718				89,418	86,718	84,104
Europe
Segment Reporting Information [Line Items]
Sales to external customers									293,156	321,618	293,092
Intercompany sales									207,357	113,914	98,491
Net income:
Continuing operations									6,843	22,808	22,002
Discontinued operations									0	0	0
Total assets	412,144				236,801				412,144	236,801	258,057
Interest income									60	111	90
Interest expense									0	0	0
Noncash items:
Depreciation and amortization									7,737	6,357	5,357
Pension expense									(7,527)	(6,234)	(6,328)
Income tax provision									14,213	9,452	7,334
Capital expenditures									10,727	10,859	11,833
Net property	41,922				32,892				41,922	32,892	33,162
International
Segment Reporting Information [Line Items]
Sales to external customers									228,644	264,528	285,805
Intercompany sales									18,831	18,449	22,136
Net income:
Continuing operations									10,137	16,977	27,900
Discontinued operations									1,217	1,059	2,389
Total assets	175,449				188,360				175,449	188,360	192,754
Interest income									840	711	809
Interest expense									0	0	0
Noncash items:
Depreciation and amortization									3,899	4,929	5,768
Pension expense									(669)	(579)	(1,175)
Income tax provision									4,046	7,276	9,300
Capital expenditures									5,443	4,347	6,797
Net property	24,498				31,741				24,498	31,741	35,488
Corporate
Segment Reporting Information [Line Items]
Sales to external customers									0	0	0
Intercompany sales									0	0	0
Net income:
Continuing operations									(33,218)	(30,324)	(31,962)
Discontinued operations									0	0	0
Total assets	16,362				20,865				16,362	20,865	18,419
Interest income									6	5	0
Interest expense									10,854	9,851	10,677
Noncash items:
Depreciation and amortization									0	0	0
Pension expense									0	0	0
Income tax provision									(19,804)	(15,972)	(16,101)
Capital expenditures									0	0	0
Net property	1				1				1	1	1
Reconciling Items
Segment Reporting Information [Line Items]
Sales to external customers									0	0	0
Intercompany sales									(359,543)	(249,158)	(241,579)
Net income:
Continuing operations									(1,264)	299	(263)
Discontinued operations									0	0	0
Total assets	(97)				(329)				(97)	(329)	629
Interest income									0	0	0
Interest expense									0	0	0
Noncash items:
Depreciation and amortization									0	0	0
Pension expense									0	0	0
Income tax provision									103	(631)	265
Capital expenditures									0	0	0
Net property	$ 0				$ 0				$ 0	$ 0	$ 0