Summary of Significant Accounting Policies - Additional Information (Detail)				3 Months Ended								12 Months Ended
	Jun. 26, 2017 USD ($)	Dec. 31, 2016 USD ($) Derivative shares	Jul. 01, 2016 USD ($)	Dec. 31, 2017 USD ($) Derivative	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Derivative	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Facility Derivative Segment	Dec. 31, 2016 USD ($) Derivative	Dec. 31, 2015 USD ($)	Jan. 01, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of facilities for manufacture and distribution of products | Facility												4
Long-lived assets, held for sale		$ 0		$ 0				$ 0				$ 0	$ 0
Impairments of goodwill													1,600,000
Anticipated cash flows discount rate														10.00%
Impairment charges													1,621,000	$ 43,188,000
Carrying value of plant assets		1,346,499,000		1,281,567,000				1,346,499,000				1,281,567,000	1,346,499,000
Carrying value of capitalized software		12,900,000		13,100,000				12,900,000				13,100,000	12,900,000
Capitalized software, accumulated amortization		$ 3,500,000		5,600,000				$ 3,500,000				5,600,000	3,500,000
Interest cost capitalized												300,000	$ 15,000,000	30,600,000
Insurance coverage of general liability and auto liability risks				100,000,000								100,000,000
Insurance policy covering pollution liability				$ 50,000,000								$ 50,000,000
Tax benefit recognized												Greater than 50%
Incentive tax credit receivable												$ 8,100,000
Number of derivatives held with fair value eligible for offset | Derivative		0		0				0				0	0
Number of reportable segment | Segment												1
Net sales				$ 88,917,000	$ 92,390,000	$ 122,853,000	$ 123,344,000	$ 85,369,000	$ 80,262,000	$ 109,982,000	$ 98,972,000	$ 427,504,000	$ 374,585,000	437,695,000
Cost of sales												422,038,000	423,891,000	417,647,000
Selling, general and administrative expense												34,990,000	40,168,000	49,813,000
Net cash provided (used) by continuing operating activities												2,276,000	(22,038,000)	(4,780,000)
Net cash provided (used) by continuing financing activities												(16,132,000)	(193,709,000)	264,019,000
Net cash provided (used) by operating activities												(1,461,000)	(1,363,000)	38,313,000
Net cash provided (used) by financing activities												(236,000)	(2,340,000)	(1,292,000)
Accounting Standards Update 2014-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Net sales												65,400,000
Cost of sales												64,700,000
Selling, general and administrative expense												700,000
ASU No. 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect recorded as deferred tax asset															$ 1,100,000
Net cash provided (used) by continuing operating activities													(100,000)	(300,000)
Net cash provided (used) by continuing financing activities													100,000	(300,000)
Net cash provided (used) by operating activities													(300,000)
Net cash provided (used) by financing activities													300,000
Number of estimated forfeitures on outstanding equity awards | shares		0
Accounting pronouncements adjustment on forfeiture		$ 0						0					0
Plant, Property and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Incentive tax credit receivable												$ 7,400,000
Capitalized Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the software												8 years
Interest cost capitalized												$ 0	100,000	300,000
Amortization expense												2,100,000	$ 1,700,000	$ 1,000,000
Estimated amortization related to capitalized software, 2018				2,400,000								2,400,000
Estimated amortization related to capitalized software, 2019				1,200,000								1,200,000
Estimated amortization related to capitalized software, 2020				1,200,000								1,200,000
Estimated amortization related to capitalized software, 2021				1,200,000								1,200,000
Estimated amortization related to capitalized software, 2022				1,000,000								$ 1,000,000
Customer [Member] | Net Sales [Member] | Covestro [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total net sales												12.00%	13.00%	15.00%
Customer [Member] | Net Sales [Member] | Koch Fertilizer LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total net sales												10.00%	11.00%	12.00%
Pryor Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment charges														$ 3,500,000
Carrying value of plant assets														8,500,000
Fair value of plant assets														5,000,000
Marcellus Shale Region [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment charges														39,700,000
Carrying value of natural gas properties														62,200,000
Fair value of natural gas properties														$ 22,500,000
Proved undeveloped reserves development period														5 years
Non US [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents held				$ 1,900,000								$ 1,900,000
Climate Control Group [Member]
Summary Of Significant Accounting Policies [Line Items]
Purchase price of outstanding shares of stock to be sold under Stock Purchase Agreement			$ 364,000,000
Cost of Sales [Member]
Summary Of Significant Accounting Policies [Line Items]
Incentive tax credit receivable												700,000
Zena Energy L.L.C [Member] | Other Products [Member]
Summary Of Significant Accounting Policies [Line Items]
Net sales												8,600,000	$ 9,100,000	$ 12,900,000
Zena Energy L.L.C [Member] | B K V Chelsea L L C [Member]
Summary Of Significant Accounting Policies [Line Items]
Purchase price receivable subject to customary pre-closing and post-closing adjustments	$ 16,300,000
Net proceeds from sale of oil and gas properties	$ 3,500,000
Zena Energy L.L.C [Member] | B K V Chelsea L L C [Member] | Plant, Property and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Carrying value of asset sold		$ 20,000,000						$ 20,000,000					$ 20,000,000
Zena Energy L.L.C [Member] | B K V Chelsea L L C [Member] | Operating Other Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Loss on sale of asset												$ 4,000,000