Supplemental Guarantor Financial Information - Consolidating Statement Of Operation and Comprehensive (Loss) Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Net sales	$ 130,967	$ 138,858	$ 139,723	$ 133,384	$ 133,721	$ 135,042	$ 138,324	$ 139,805	$ 542,932	$ 546,892	$ 538,740
Costs and expenses:
Cost of products sold	78,207	83,364	84,372	81,218	84,629	81,656	85,674	85,298	327,161	337,256	345,171
Selling	17,641	18,195	18,988	18,178	18,252	17,779	18,095	19,221	73,002	73,348	78,197
General and administrative	13,202	14,133	14,407	14,797	14,796	15,278	15,506	14,634	56,539	60,214	63,701
Research and development	2,004	1,909	2,044	1,946	1,970	1,845	2,089	1,954	7,903	7,858	9,567
Restructuring	2,430	3,466	7,595	4,651	6,390	3,034	4,165	1,255	18,142	14,844	25,708
Total operating costs and expenses	113,484	121,067	127,406	120,790	126,037	119,592	125,529	122,362	482,747	493,520	522,344
(Loss) income from operations	17,483	17,791	12,317	12,594	7,684	15,450	12,795	17,443	60,185	53,372	16,396
Interest (expense) income, net	(9,782)	(9,412)	(8,917)	(8,657)	(8,983)	(9,378)	(13,112)	(9,206)	(36,768)	(40,681)	(37,878)
Foreign exchange loss	98	367	(307)	(877)	50	(905)	50	(249)	(719)	(1,052)	(358)
Equity in subsidiaries income									0	0	0
(Loss) gain on debt extinguishment	0	0	0	0	0	0	(3,123)	0	0	(3,123)	243
Dividend income										0	0
Income (loss) before (provision) benefit for income taxes	7,799	8,746	3,093	3,060	(1,249)	5,167	(3,390)	7,988	22,698	8,516	(21,597)
(Provision) benefit for income taxes	3,360	(29,218)	(2,329)	(1,893)	4,692	(3,063)	(3,489)	(2,503)	(30,080)	(4,363)	3,562
Net (loss) income	11,159	(20,472)	764	1,167	3,443	2,104	(6,879)	5,485	(7,382)	4,153	(18,035)
Comprehensive (loss) income	(23,785)	(41,003)	2,278	(758)	13,330	9,182	(9,245)	2,727	(63,268)	15,994	(28,382)
Parent
Condensed Income Statements, Captions [Line Items]
Net sales									0	0	0
Costs and expenses:
Cost of products sold									(1,372)	(1,690)	(1,451)
Selling									945	0	0
General and administrative									8,718	8,114	10,241
Research and development									1,007	0	0
Restructuring									576	1,016	163
Total operating costs and expenses									9,874	7,440	8,953
(Loss) income from operations									(9,874)	(7,440)	(8,953)
Interest (expense) income, net									(35,016)	(32,279)	(28,115)
Foreign exchange loss									(827)	(585)	(612)
Equity in subsidiaries income									38,777	47,997	17,875
(Loss) gain on debt extinguishment										(3,123)	243
Dividend income										0	1,657
Income (loss) before (provision) benefit for income taxes									(6,940)	4,570	(17,905)
(Provision) benefit for income taxes									(442)	(417)	(130)
Net (loss) income									(7,382)	4,153	(18,035)
Comprehensive (loss) income									(20,810)	12,495	(18,488)
Total Guarantors
Condensed Income Statements, Captions [Line Items]
Net sales									184,053	182,935	178,613
Costs and expenses:
Cost of products sold									126,004	125,834	129,127
Selling									20,628	22,672	24,319
General and administrative									8,448	4,958	6,525
Research and development									4,676	5,489	6,371
Restructuring									936	847	510
Total operating costs and expenses									160,692	159,800	166,852
(Loss) income from operations									23,361	23,135	11,761
Interest (expense) income, net									5,469	5,665	6,503
Foreign exchange loss									(215)	(171)	(46)
Equity in subsidiaries income									8,014	15,562	(20,177)
(Loss) gain on debt extinguishment										0	0
Dividend income										1,555	22,928
Income (loss) before (provision) benefit for income taxes									36,629	45,746	20,969
(Provision) benefit for income taxes									(135)	9	(131)
Net (loss) income									36,494	45,755	20,838
Comprehensive (loss) income									36,072	46,059	21,644
Total Non Guarantors
Condensed Income Statements, Captions [Line Items]
Net sales									395,751	411,931	407,647
Costs and expenses:
Cost of products sold									239,576	261,157	265,513
Selling									51,429	50,676	53,878
General and administrative									39,373	47,143	46,935
Research and development									2,220	2,369	3,196
Restructuring									16,630	12,981	25,035
Total operating costs and expenses									349,228	374,326	394,557
(Loss) income from operations									46,523	37,605	13,090
Interest (expense) income, net									(7,221)	(14,067)	(16,266)
Foreign exchange loss									323	(295)	300
Equity in subsidiaries income									0	0	0
(Loss) gain on debt extinguishment										0	0
Dividend income										0	0
Income (loss) before (provision) benefit for income taxes									39,625	23,243	(2,876)
(Provision) benefit for income taxes									(29,503)	(3,955)	3,823
Net (loss) income									10,122	19,288	947
Comprehensive (loss) income									(31,914)	22,483	(9,753)
Other Eliminations
Condensed Income Statements, Captions [Line Items]
Net sales									(36,872)	(47,974)	(47,520)
Costs and expenses:
Cost of products sold									(37,047)	(48,046)	(48,018)
Selling									0	0	0
General and administrative									0	0	0
Research and development									0	0	0
Restructuring									0	0	0
Total operating costs and expenses									(37,047)	(48,046)	(48,018)
(Loss) income from operations									175	72	498
Interest (expense) income, net									0	0	0
Foreign exchange loss									0	0	0
Equity in subsidiaries income									(46,791)	(63,560)	2,302
(Loss) gain on debt extinguishment										0	0
Dividend income										(1,555)	(24,585)
Income (loss) before (provision) benefit for income taxes									(46,616)	(65,043)	(21,785)
(Provision) benefit for income taxes									0	0	0
Net (loss) income									(46,616)	(65,043)	(21,785)
Comprehensive (loss) income									$ (46,616)	$ (65,043)	$ (21,785)