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Components of Operating Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Component of Operating Other Cost and Expense [Abstract]        
Fixed compensation expense $ 7,445 $ 5,808 $ 21,109 $ 17,524
Variable compensation expense 2,418 5,621 8,170 14,418
Equity compensation expense 2,261 1,997 7,415 7,880
Severance expense 4 445 226 3,879
Total compensation expense 12,128 13,871 36,920 43,701
Systems and consulting 3,463 2,780 10,906 6,840
Accounting and legal 1,223 2,066 4,039 5,118
Office costs 1,282 829 3,437 2,444
Corporate costs 569 508 1,679 1,545
Other operating expenses 2,741 2,266 6,679 7,289
Total Operating Expenses $ 21,406 $ 22,320 $ 63,660 $ 66,937