Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued expenses	$ 19,486	$ 14,054
Accrued compensation	10,387	28,780
Deferred rent	5,473	4,615
Deferred tax liability	3,623	3,446
Deferred revenue	3,402	2,551
Loan servicing liabilities, at fair value	2,827	3,973
Payable To Issuing Bank	1,820	955
Transaction fee refund reserve	1,292	578
Early stock option exercise and other equity-related liabilities	71	83
Contingent liabilities	39	700
Other	1,668	1,508
Total accrued expenses and other liabilities	$ 50,088	$ 61,243