Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other Assets [Abstract]
Other assets	$ 24,679	$ 14,332
Prepaid expenses
Other Assets [Abstract]
Other assets	8,829	6,807
Loan servicing assets at fair value
Other Assets [Abstract]
Other assets	7,249	2,181
Accounts receivable
Other Assets [Abstract]
Other assets	3,322	1,744
Deferred acquisition compensation
Other Assets [Abstract]
Other assets	1,815	2,695
Deposits
Other Assets [Abstract]
Other assets	763	657
Receivable from investors
Other Assets [Abstract]
Other assets	568	155
Other
Other Assets [Abstract]
Other assets	$ 2,133	$ 93