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Operating Expenses - Components of Operating Expenses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fixed compensation expense |  |  |  |  |  |  |  |  | $ 35,093 | $ 29,057 | $ 23,248
Variable compensation expense |  |  |  |  |  |  |  |  | 12,606 | 14,863 | 22,245
Equity compensation expense |  |  |  |  |  |  |  |  | 11,921 | 9,750 | 10,077
Total compensation expense |  |  |  |  |  |  |  |  | 59,620 | 53,670 | 55,570
Systems and consulting |  |  |  |  |  |  |  |  | 10,212 | 11,654 | 7,517
Loan acquisition costs |  |  |  |  |  |  |  |  | 10,326 | 8,207 | 7,605
Accounting and legal |  |  |  |  |  |  |  |  | 4,837 | 5,244 | 6,263
Office costs |  |  |  |  |  |  |  |  | 5,270 | 5,011 | 3,503
Corporate costs |  |  |  |  |  |  |  |  | 2,049 | 2,237 | 2,721
Other operating expenses |  |  |  |  |  |  |  |  | 5,102 | 4,100 | 3,428
Total Operating Expenses | $ 22,638 | $ 24,497 | $ 25,218 | $ 25,063 | $ 26,462 | $ 21,406 | $ 22,282 | $ 19,973 | $ 97,416 | $ 90,123 | 86,607
Severance expense |  |  |  |  |  |  |  |  |  |  | $ 4,000

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- Definition Variable Compensation Expense + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense in the period for communications and data processing expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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