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Summary of Significant Accounting Policies - Additional Information 3 (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00% |
Derivative instruments | $ (6,780,000) | $ 0 | $ (6,780,000) | $ 0 | $ 4,351,000

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