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Operating Expenses - Components of Operating Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other Income and Expenses [Abstract]        
Fixed compensation expense $ 8,642 $ 7,445 $ 27,083 $ 21,109
Variable compensation expense 3,567 2,422 11,135 8,396
Equity compensation expense 2,835 2,261 9,112 7,415
Total compensation expense 15,044 12,128 47,330 36,920
Systems and consulting 2,355 3,463 6,718 10,906
Loan acquisition costs 2,464 1,789 5,992 3,606
Accounting and legal 1,047 1,223 3,754 4,039
Office costs 1,314 1,282 3,912 3,437
Corporate costs 484 569 1,521 1,679
Other operating expenses 1,789 952 5,551 3,073
Total Operating Expenses $ 24,497 $ 21,406 $ 74,778 $ 63,660