Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenue recognized in accordance with ASC 606	$ 582,038	$ 566,848	$ 1,640,315	$ 1,581,244
Revenue on leases	1,500	2,300	4,900	10,200
Deferred Revenue And Customer Advances	14,200	24,500	47,600	70,900
Trade Accounts Receivable	$ 113,400	$ 10,600	$ 113,400	$ 10,600
Short-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	69.00%		69.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			12 months
Long-term Contract with Customer [Member]
Revenue, Remaining Performance Obligation, Percentage	26.00%		26.00%
Long-term Contract with Customer [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			3 years
Long-term Contract with Customer [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period			1 year
Accounting Standards Update 2014-09 [Member]
Revenue recognized in accordance with ASC 606	$ 580,600		$ 1,635,500