Related Party Transactions - Balances of Transactions (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Related Party Transactions [Abstract]
Cash and restricted cash deposits in affiliated bank	$ 80,149	$ 64,724
Other due to/from affiliate
Accounts receivable	26,944	39,095
Prepaid expenses and other assets	4,466	4,211
Operating lease right-of use assets	17,993	20,617
Other long-term assets	11	57
Accounts payable	4,523	7,250
Unearned income	34,621	35,489
Operating lease liabilities	$ 18,442	$ 20,905