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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Apr. 25, 2018
Related Party Transaction [Line Items]    
Debt issuance costs   $ 15.2
Preferred stock, accumulated dividends $ 1.2  
Affiliate of LSB Funding [Member]    
Related Party Transaction [Line Items]    
Debt issuance costs 0.1  
Consent fee incurred, associated with issuance of new notes 0.3  
Senior secured notes outstanding $ 50.0