Condensed consolidating guarantor financial information - cash flows (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) provided by operating activities from continuing operations		$ 303,446	$ 290,241	$ 231,299
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment		(61,448)	(67,571)	(63,580)
Payments for businesses and intangibles acquired, net of cash acquired		(93,808)	(45,777)	(309,008)
Proceeds from sale of assets		408	5,251	0
Investments in affiliates		0	(40)	(50)
Net cash used in investing activities from continuing operations		(154,848)	(108,137)	(372,638)
Proceeds from share based compensation plans and the related tax impacts
Proceeds from new borrowings		288,100	250,000	680,000
Reduction in borrowings		(303,757)	(480,102)	(375,000)
Debt extinguishment, issuance and amendment fees		(9,017)	(4,494)	(6,400)
Proceeds from share based compensation plans and the related tax impacts		4,994	4,245	6,181
Payments to noncontrolling interest shareholders		(1,343)	(1,094)	(736)
Payments for contingent consideration		(8,028)	0	(16,958)
Proceeds from issuance of shares		0
Dividends paid		(56,532)	(56,258)	(55,917)
Intercompany transactions		0	0	0
Intercompany dividends paid		0	0	0
Net cash (used in) provided by financing activities from continuing operations		(85,583)	(287,703)	231,170
Net cash used in operating activities		(2,636)	(3,676)	(3,327)
Net cash used in discontinued operations		(2,636)	(3,676)	(3,327)
Effect of exchange rate changes on cash and cash equivalents		(25,249)	(19,473)	8,441
Net increase (decrease) in cash and cash equivalents		35,130	(128,748)	94,945
Cash and cash equivalents at the beginning of the year	$ 431,984	303,236	431,984	337,039
Cash and cash equivalents at the end of the year		338,366	303,236	431,984
Eliminations
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) provided by operating activities from continuing operations		(3,812)	(4,429)	(66,866)
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment		0	0	0
Payments for businesses and intangibles acquired, net of cash acquired		0	0	0
Proceeds from sale of assets		0	0
Investments in affiliates		121,850	0	0
Net cash used in investing activities from continuing operations		121,850	0	0
Proceeds from share based compensation plans and the related tax impacts
Proceeds from new borrowings		0	0	0
Reduction in borrowings		0	0	0
Debt extinguishment, issuance and amendment fees		0	0	0
Proceeds from share based compensation plans and the related tax impacts		0	0	0
Payments to noncontrolling interest shareholders		0	0	0
Payments for contingent consideration		0		0
Proceeds from issuance of shares		(121,850)
Dividends paid		0	0	0
Intercompany transactions		0	0	0
Intercompany dividends paid	4,429	3,812	4,429	66,866
Net cash (used in) provided by financing activities from continuing operations		(118,038)	4,429	66,866
Net cash used in operating activities		0	0	0
Net cash used in discontinued operations		0	0	0
Effect of exchange rate changes on cash and cash equivalents		0	0	0
Net increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents at the beginning of the year	0	0	0	0
Cash and cash equivalents at the end of the year		0	0	0
Parent Company
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) provided by operating activities from continuing operations		(147,704)	(105,467)	(123,765)
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment		(124)	(2,273)	(1,553)
Payments for businesses and intangibles acquired, net of cash acquired		0	0	0
Proceeds from sale of assets		408	1,669
Investments in affiliates		0	(60)	(50)
Net cash used in investing activities from continuing operations		284	(664)	(1,603)
Proceeds from share based compensation plans and the related tax impacts
Proceeds from new borrowings		288,100	250,000	680,000
Reduction in borrowings		(303,757)	(480,102)	(375,000)
Debt extinguishment, issuance and amendment fees		(9,017)	(4,494)	(6,400)
Proceeds from share based compensation plans and the related tax impacts		4,994	4,245	6,181
Payments to noncontrolling interest shareholders		0	0	0
Payments for contingent consideration		0		0
Proceeds from issuance of shares		0
Dividends paid		(56,532)	(56,258)	(55,917)
Intercompany transactions		219,035	381,663	(148,880)
Intercompany dividends paid		0	0	0
Net cash (used in) provided by financing activities from continuing operations		142,823	95,054	99,984
Net cash used in operating activities		(1,787)	(3,676)	(2,727)
Net cash used in discontinued operations		(1,787)	(3,676)	(2,727)
Effect of exchange rate changes on cash and cash equivalents		0	0	0
Net increase (decrease) in cash and cash equivalents		(6,384)	(14,753)	(28,111)
Cash and cash equivalents at the beginning of the year	42,749	27,996	42,749	70,860
Cash and cash equivalents at the end of the year		21,612	27,996	42,749
Guarantor Subsidiaries
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) provided by operating activities from continuing operations		134,817	347,503	181,290
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment		(32,797)	(30,586)	(47,633)
Payments for businesses and intangibles acquired, net of cash acquired		(60,336)	(17,241)	(250,912)
Proceeds from sale of assets		0	3,421
Investments in affiliates		0	20	0
Net cash used in investing activities from continuing operations		(93,133)	(44,386)	(298,545)
Proceeds from share based compensation plans and the related tax impacts
Proceeds from new borrowings		0	0	0
Reduction in borrowings		0	0	0
Debt extinguishment, issuance and amendment fees		0	0	0
Proceeds from share based compensation plans and the related tax impacts		0	0	0
Payments to noncontrolling interest shareholders		0	0	0
Payments for contingent consideration		(8,028)		(14,802)
Proceeds from issuance of shares		121,850
Dividends paid		0	0	0
Intercompany transactions		(155,506)	(317,617)	144,568
Intercompany dividends paid		0	0
Net cash (used in) provided by financing activities from continuing operations		(41,684)	(317,617)	129,766
Net cash used in operating activities		0	0	0
Net cash used in discontinued operations		0	0	0
Effect of exchange rate changes on cash and cash equivalents		0	0	0
Net increase (decrease) in cash and cash equivalents		0	(14,500)	12,511
Cash and cash equivalents at the beginning of the year	14,500	0	14,500	1,989
Cash and cash equivalents at the end of the year		0	0	14,500
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) provided by operating activities from continuing operations		320,145	52,634	240,640
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment		(28,527)	(34,712)	(14,394)
Payments for businesses and intangibles acquired, net of cash acquired		(33,472)	(28,536)	(58,096)
Proceeds from sale of assets		0	161
Investments in affiliates		(121,850)	0	0
Net cash used in investing activities from continuing operations		(183,849)	(63,087)	(72,490)
Proceeds from share based compensation plans and the related tax impacts
Proceeds from new borrowings		0	0	0
Reduction in borrowings		0	0	0
Debt extinguishment, issuance and amendment fees		0	0	0
Proceeds from share based compensation plans and the related tax impacts		0	0	0
Payments to noncontrolling interest shareholders		(1,343)	(1,094)	(736)
Payments for contingent consideration		0		(2,156)
Proceeds from issuance of shares		0
Dividends paid		0	0	0
Intercompany transactions		(63,529)	(64,046)	4,312
Intercompany dividends paid		(3,812)	(4,429)	(66,866)
Net cash (used in) provided by financing activities from continuing operations		(68,684)	(69,569)	(65,446)
Net cash used in operating activities		(849)	0	(600)
Net cash used in discontinued operations		(849)	0	(600)
Effect of exchange rate changes on cash and cash equivalents		(25,249)	(19,473)	8,441
Net increase (decrease) in cash and cash equivalents		41,514	(99,495)	110,545
Cash and cash equivalents at the beginning of the year	$ 374,735	275,240	374,735	264,190
Cash and cash equivalents at the end of the year		$ 316,754	$ 275,240	$ 374,735