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Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail)	Apr. 11, 2018
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

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