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Business and Organization - Additional Information (Detail) - Segment | 3 Months Ended | 7 Months Ended
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Mar. 31, 2019 | Jul. 31, 2017
Accounting Policies [Abstract] |  |
Number of reportable segments | 2 | 1

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration