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Commitments and Contingencies - Additional Information (Detail)
shares in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Agreement
shares
Commitments And Contingencies [Line Items]  
Number of promoted interest agreements 6
Number of promoted interest agreements not met established performance metrics 5
Number of promoted interest agreements met established performance metrics 1
Company accrued interest to holder's | $ $ 0
Advisor Expense Support Agreement | Restricted Stock  
Commitments And Contingencies [Line Items]  
Contingently issuable restricted stock shares | shares 1.3