Funds Borrowed - Schedule of Outstanding Balances of Funds Borrowed (Parenthetical) (Detail) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Debt Disclosure [Abstract]
Deferred costs	$ 4,709,000	$ 5,105,000	$ 5,584,000
Reserve Deposits	$ 250,000