Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Other assets	$ 53,860	$ 38,413
Loan servicing assets, at fair value
Other Assets [Abstract]
Other assets	16,964	10,250
Prepaid expenses
Other Assets [Abstract]
Other assets	13,825	16,283
Other investments
Other Assets [Abstract]
Other assets	10,250	250
Accounts receivable
Other Assets [Abstract]
Other assets	5,745	4,976
Receivable from investors
Other Assets [Abstract]
Other assets	1,706	1,117
Deferred financing cost
Other Assets [Abstract]
Other assets	1,229	1,296
Deferred Acquisition Compensation
Other Assets [Abstract]
Other assets	1,228	1,521
Due From Related Parties
Other Assets [Abstract]
Other assets	897	655
Deposits
Other Assets [Abstract]
Other assets	872	871
Tenant improvement receivable
Other Assets [Abstract]
Other assets	778	778
Other
Other Assets [Abstract]
Other assets	$ 366	$ 416