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Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail)
Apr. 11, 2018
September 30, 2018 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.75
December 31, 2018 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.75
March 31, 2019 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.75
June 30, 2019 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.50
September 30, 2019 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.50
December 31, 2019 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.50
March 31, 2020 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.25
June 30, 2020 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.25
September 30, 2020 [Member]  
Credit Facility [Line Items]  
Total Leverage Ratio 2.00