Pension and Postretirement Benefit Obligations - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) Benefit_Plan	Sep. 30, 2018 Benefit_Plan	Dec. 30, 2018 USD ($)
Rehabilitation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi-employer pension plan Rehabilitation Plan adoption effective date		Jan. 01, 2015
Collective bargaining agreement, effective date		Apr. 28, 2014
Employer-Teamsters and Pension Trust Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi-employer plans collective bargaining remainder of arrangements, expiration date		Apr. 30, 2020
Net Pension Activity [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of company-sponsored pension plans | Benefit_Plan	2	2
Entity contribution to pension plans during the period	$ 20,000,000
Net Pension Activity [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit pension plan, contributions			$ 0