Condensed consolidating guarantor financial information - income (loss) and comprehensive income (loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Net revenues	$ 476,008	$ 457,173	$ 468,105	$ 438,546	$ 450,539	$ 413,796	$ 420,059	$ 411,877	$ 1,839,832	$ 1,696,271	$ 1,551,009
Cost of goods sold									897,404	857,326	802,784
Gross profit	241,015	236,166	244,088	221,159	224,943	203,992	209,490	200,520	942,428	838,945	748,225
Selling, general and administrative expenses									578,657	502,187	454,489
Research and development expenses									61,040	65,045	56,278
Goodwill impairment									0	0	332,128
Restructuring and other impairment charges									17,869	38,452	3,037
Income (loss) from continuing operations before interest, loss on extinguishments of debt and taxes	69,155	81,935	74,752	59,020	54,064	66,042	63,751	49,404	284,862	233,261	(97,375)
Net (gain) loss on sales of businesses and assets									0	0	(332)
Income (loss) from continuing operations before interest and taxes											(97,375)
Interest expense									65,458	56,905	69,565
Interest income									(706)	(624)	(1,571)
Loss on extinguishments of debt									0	1,250	0
Income (loss) from continuing operations before taxes									220,110	175,730	(165,369)
Taxes (benefit) on income (loss) from continuing operations									28,650	23,547	16,413
Equity in net income of consolidated subsidiaries									0	0	0
Income (loss) from continuing operations	52,133	55,228	48,830	35,269	35,302	45,779	43,401	27,701	191,460	152,183	(181,782)
Operating loss from discontinued operations									(3,407)	(2,205)	(9,207)
Taxes (benefit) on income (loss) from discontinued operations									(698)	(1,770)	(1,887)
Loss from discontinued operations	(1,188)	(271)	(1,125)	(125)	(236)	1,029	(766)	(462)	(2,709)	(435)	(7,320)
Net income (loss)	50,945	54,957	47,705	35,144	35,066	46,808	42,635	27,239	188,751	151,748	(189,102)
Less: Income from continuing operations attributable to noncontrolling interest	307	126	453	186	238	234	194	201	1,072	867	955
Net income (loss)	50,638	54,831	47,252	34,958	34,828	46,574	42,441	27,038	187,679	150,881	(190,057)
Other comprehensive loss attributable to common shareholders									(150,040)	21,193	27,305
Comprehensive income attributable to common shareholders									37,639	172,074	(162,752)
Eliminations
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Net revenues									(371,171)	(268,317)	(233,782)
Cost of goods sold									(363,594)	(268,501)	(232,823)
Gross profit									(7,577)	184	(959)
Selling, general and administrative expenses									(384)	(307)	267
Research and development expenses									0	0	0
Goodwill impairment											0
Restructuring and other impairment charges									0	0	0
Income (loss) from continuing operations before interest, loss on extinguishments of debt and taxes									(7,193)	491
Net (gain) loss on sales of businesses and assets											265,433
Income (loss) from continuing operations before interest and taxes											(266,659)
Interest expense									0	0	0
Interest income									0	0	0
Loss on extinguishments of debt										0
Income (loss) from continuing operations before taxes									(7,193)	491	(266,659)
Taxes (benefit) on income (loss) from continuing operations									108	(754)	(519)
Equity in net income of consolidated subsidiaries									(542,475)	(405,530)	65,824
Income (loss) from continuing operations									(549,776)	(404,285)	(200,316)
Operating loss from discontinued operations									0	0	0
Taxes (benefit) on income (loss) from discontinued operations									0	0	0
Loss from discontinued operations									0	0	0
Net income (loss)									(549,776)	(404,285)	(200,316)
Less: Income from continuing operations attributable to noncontrolling interest									0	0	0
Net income (loss)									(549,776)	(404,285)	(200,316)
Other comprehensive loss attributable to common shareholders									257,008	(7,402)	(19,382)
Comprehensive income attributable to common shareholders									(292,768)	(411,687)	(219,698)
Parent Company
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Net revenues									0	0	0
Cost of goods sold									0	0	0
Gross profit									0	0	0
Selling, general and administrative expenses									42,829	39,176	34,657
Research and development expenses									0	0	0
Goodwill impairment											0
Restructuring and other impairment charges									0	935	0
Income (loss) from continuing operations before interest, loss on extinguishments of debt and taxes									(42,829)	(40,111)
Net (gain) loss on sales of businesses and assets											(116,193)
Income (loss) from continuing operations before interest and taxes											81,536
Interest expense									144,869	134,879	143,653
Interest income									0	(15)	(372)
Loss on extinguishments of debt										1,250
Income (loss) from continuing operations before taxes									(187,698)	(176,225)	(61,745)
Taxes (benefit) on income (loss) from continuing operations									(68,307)	(63,857)	(63,806)
Equity in net income of consolidated subsidiaries									308,396	263,469	(190,742)
Income (loss) from continuing operations									189,005	151,101	(188,681)
Operating loss from discontinued operations									(2,196)	(1,947)	(2,647)
Taxes (benefit) on income (loss) from discontinued operations									(870)	(1,727)	(1,271)
Loss from discontinued operations									(1,326)	(220)	(1,376)
Net income (loss)									187,679	150,881	(190,057)
Less: Income from continuing operations attributable to noncontrolling interest									0	0	0
Net income (loss)									187,679	150,881	(190,057)
Other comprehensive loss attributable to common shareholders									(150,040)	21,193	27,305
Comprehensive income attributable to common shareholders									37,639	172,074	(162,752)
Guarantor Subsidiaries
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Net revenues									1,078,851	1,001,404	950,888
Cost of goods sold									652,742	582,110	552,726
Gross profit									426,109	419,294	398,162
Selling, general and administrative expenses									326,282	284,960	259,476
Research and development expenses									40,546	55,694	48,649
Goodwill impairment											331,779
Restructuring and other impairment charges									10,189	15,288	598
Income (loss) from continuing operations before interest, loss on extinguishments of debt and taxes									49,092	63,352
Net (gain) loss on sales of businesses and assets											(149,240)
Income (loss) from continuing operations before interest and taxes											(93,100)
Interest expense									(85,885)	(85,058)	(81,328)
Interest income									(1)	(5)	(23)
Loss on extinguishments of debt										0
Income (loss) from continuing operations before taxes									134,978	148,415	(11,749)
Taxes (benefit) on income (loss) from continuing operations									68,690	42,804	45,068
Equity in net income of consolidated subsidiaries									233,827	141,773	124,918
Income (loss) from continuing operations									300,115	247,384	68,101
Operating loss from discontinued operations									0	0	(9,179)
Taxes (benefit) on income (loss) from discontinued operations									0	(170)	(129)
Loss from discontinued operations									0	170	(9,050)
Net income (loss)									300,115	247,554	59,051
Less: Income from continuing operations attributable to noncontrolling interest									0	0	0
Net income (loss)									300,115	247,554	59,051
Other comprehensive loss attributable to common shareholders									(130,691)	1,960	10,475
Comprehensive income attributable to common shareholders									169,424	249,514	69,526
Non-Guarantor Subsidiaries
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Net revenues									1,132,152	963,184	833,903
Cost of goods sold									608,256	543,717	482,881
Gross profit									523,896	419,467	351,022
Selling, general and administrative expenses									209,930	178,358	160,089
Research and development expenses									20,494	9,351	7,629
Goodwill impairment											349
Restructuring and other impairment charges									7,680	22,229	2,439
Income (loss) from continuing operations before interest, loss on extinguishments of debt and taxes									285,792	209,529
Net (gain) loss on sales of businesses and assets											(332)
Income (loss) from continuing operations before interest and taxes											180,848
Interest expense									6,474	7,084	7,240
Interest income									(705)	(604)	(1,176)
Loss on extinguishments of debt										0
Income (loss) from continuing operations before taxes									280,023	203,049	174,784
Taxes (benefit) on income (loss) from continuing operations									28,159	45,354	35,670
Equity in net income of consolidated subsidiaries									252	288	0
Income (loss) from continuing operations									252,116	157,983	139,114
Operating loss from discontinued operations									(1,211)	(258)	2,619
Taxes (benefit) on income (loss) from discontinued operations									172	127	(487)
Loss from discontinued operations									(1,383)	(385)	3,106
Net income (loss)									250,733	157,598	142,220
Less: Income from continuing operations attributable to noncontrolling interest									1,072	867	955
Net income (loss)									249,661	156,731	141,265
Other comprehensive loss attributable to common shareholders									(126,317)	5,442	8,907
Comprehensive income attributable to common shareholders									$ 123,344	$ 162,173	$ 150,172