Shareholders' equity - accumulated other comprehensive income (loss) into income expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold, excluding intangible asset amortization									$ 1,103,750	$ 1,063,941	$ 974,501
Income from continuing operations before taxes									339,903	219,628	284,911
Taxes on income from continuing operations									122,078	(23,196)	(129,648)
Income from continuing operations	$ 107,806	$ 228,929	$ 83,328	$ 41,918	$ 87,513	$ 56,540	$ (2,552)	$ 54,931	461,981	196,432	155,263
Interest expense									80,270	103,020	82,546
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact on income from continuing operations, net of tax									4,247	3,716	4,502
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Foreign Exchange Forward
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold, excluding intangible asset amortization									(1,284)	(2,270)	(95)
Income from continuing operations before taxes									(1,284)	(2,270)	(95)
Taxes on income from continuing operations									150	163	84
Income from continuing operations									(1,134)	(2,107)	(11)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from continuing operations before taxes									7,012	7,556	7,009
Taxes on income from continuing operations									(1,631)	(1,733)	(2,496)
Income from continuing operations									5,381	5,823	4,513
Actuarial losses									6,930	7,305	6,904
Prior-service credits									$ 82	$ 251	$ 105