Business Segments - Additional Information (Detail) - Segment |
1 Months Ended | 12 Months Ended |
---|---|---|
Aug. 31, 2018 |
Dec. 31, 2018 |
|
Segment Reporting Information [Line Items] | ||
Number of reportable segments | 3 | |
Mariner Finance, LLC | ||
Segment Reporting Information [Line Items] | ||
Stock purchase agreement, stock sold, percentage | 100.00% |