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Shareholders' equity - accumulated other comprehensive income (loss) into income expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold									$ 871,827	$ 865,287	$ 897,404
Income from continuing operations before taxes									245,725	244,646	220,110
Taxes on income from continuing operations									8,074	7,838	28,650
Income from continuing operations	$ 60,876	$ 66,200	$ 59,395	$ 51,180	$ 90,765	$ 61,571	$ 45,199	$ 39,273	237,651	236,808	191,460
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassifications, net of tax									8,013	4,616	2,235
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from continuing operations before taxes									4,511	679	(705)
Taxes on income from continuing operations									1,010	196	(111)
Income from continuing operations									3,501	483	(594)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Commodity Contract
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold									4,511	679	(705)
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									7,021	6,375	4,364
Taxes on income from continuing operations									(2,509)	(2,242)	(1,535)
Income from continuing operations									4,512	4,133	2,829
Actuarial losses									6,965	6,375	4,385
Prior-service credits									$ 56	$ 0	$ (21)

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Total costs related to goods produced and sold during the reporting period.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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