Pension and Postretirement Benefit Obligations - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) Benefit_Plan
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	Jul. 31, 2021
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of company-sponsored pension plans | Benefit_Plan	2
Entity contribution to pension plans during the period	$ 0
Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit pension plan, contributions	1,000,000
Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit pension plan, contributions	$ 2,000,000