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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jul. 01, 2016
USD ($)
Dec. 31, 2016
USD ($)
Facility
Derivative
Segment
Dec. 31, 2015
USD ($)
Derivative
Dec. 31, 2014
USD ($)
Mar. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of facilities for manufacture and distribution of products | Facility   4      
Goodwill     $ 1,600    
Impairments of goodwill   $ 1,600      
Anticipated cash flows discount rate     10.00%    
Impairment charges   1,621 $ 43,188    
Carrying value of plant assets   1,346,499 1,200,207    
Carrying value of capitalized software   12,900 12,800    
Capitalized software, accumulated amortization   3,500 1,800    
Interest cost capitalized   15,000 $ 30,600 $ 14,100  
Insurance coverage of general liability and auto liability risks   100,000      
Insurance policy covering pollution liability   $ 50,000      
Tax benefit recognized   Greater than 50%      
Number of derivatives held with fair value eligible for offset | Derivative   0 0    
Number of reportable segment | Segment   1      
Scenario Forecast [Member] | ASU No. 2016-09 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Cumulative effect recorded as deferred tax asset         $ 1,100
Capitalized Software [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives of the software   8 years      
Interest cost capitalized   $ 100 $ 300 500  
Amortization expense   1,700 $ 1,000 $ 300  
Estimated amortization related to capitalized software, 2017   1,700      
Estimated amortization related to capitalized software, 2018   1,600      
Estimated amortization related to capitalized software, 2019   1,500      
Estimated amortization related to capitalized software, 2020   1,500      
Estimated amortization related to capitalized software, 2021   $ 1,500      
Customer [Member] | Net Sales [Member] | Covestro [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage of total net sales   13.00% 15.00% 14.00%  
Customer [Member] | Net Sales [Member] | Koch Fertilizer LLC [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage of total net sales   11.00% 12.00% 7.00%  
Pryor Facility [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges     $ 3,500    
Carrying value of plant assets     8,500    
Fair value of plant assets     5,000    
Marcellus Shale Region [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges     39,700    
Carrying value of natural gas properties     62,200    
Fair value of natural gas properties     $ 22,500    
Proved undeveloped reserves development period     5 years    
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        
Other Products [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Net sales   $ 9,100 $ 12,900 $ 24,500