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Summary of Significant Accounting Policies - Summary of Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail) - Long Term Debt
Jun. 30, 2020
7.5% Senior Notes due 2025  
Fair Value Option Quantitative Disclosures [Line Items]  
Interest rate on debt instrument 7.50%
9.75% Senior Notes due 2026  
Fair Value Option Quantitative Disclosures [Line Items]  
Interest rate on debt instrument 9.75%