Pension and Post-Retirement Benefit Plans - Summary of Retrospective Presentation of Periodic Pension Cost in Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Warehousing, marketing and administrative expenses		$ 156,574		$ 322,119
Operating income (loss)		8,613		(49,817)
Interest and other expense, net		8,850		17,072
Income (loss) before income taxes		$ (237)	$ 9,600	$ (66,889)	$ (183,400)
Revised [Member]
Defined Benefit Plan Disclosure [Line Items]
Warehousing, marketing and administrative expenses	[1]		160,972		333,270
Operating income (loss)	[1]		16,592		(168,867)
Interest and other expense, net	[1]		7,022		14,485
Income (loss) before income taxes	[1]		9,570		(183,352)
ASU 2017-07 [Member]
Defined Benefit Plan Disclosure [Line Items]
Warehousing, marketing and administrative expenses			160,972		333,270
Operating income (loss)			16,592		(168,867)
Interest and other expense, net			7,022		14,485
Income (loss) before income taxes			9,570		(183,352)
ASU 2017-07 [Member] | As reported [Member]
Defined Benefit Plan Disclosure [Line Items]
Warehousing, marketing and administrative expenses			161,695		334,717
Operating income (loss)			15,869		(170,314)
Interest and other expense, net			6,299		13,038
Income (loss) before income taxes			9,570		(183,352)
ASU 2017-07 [Member] | Revised [Member]
Defined Benefit Plan Disclosure [Line Items]
Warehousing, marketing and administrative expenses			(723)		(1,447)
Operating income (loss)			723		1,447
Interest and other expense, net			$ 723		$ 1,447

[1] Revised for the impact of the adoption of a new pension accounting pronouncement (see Note 9 – “Pension and Post-Retirement Benefit Plans”) for further detail.