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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 |

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