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

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