Commitments (Additional Information) (Detail) $ in Millions	9 Months Ended
	Sep. 29, 2017 USD ($)
Standby Letters of Credit
Other Commitments And Contingencies [Line Items]
Amount outstanding	$ 92
Performance Guarantee
Other Commitments And Contingencies [Line Items]
Surety bonds	$ 155
Standby Letters of Credit and Surety Bonds [Member]
Other Commitments And Contingencies [Line Items]
Debt Instrument, Term	4 years