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Financial Instruments - Additional Information (Detail) (USD $) | 9 Months Ended |  |  |  | 9 Months Ended |  |  | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Auction Rate Securities Owned [Member] | Sep. 30, 2014 Deferred Compensation [Member] Corporate Equities Liabilities [Member] | Dec. 31, 2013 Deferred Compensation [Member] Corporate Equities Liabilities [Member] | Sep. 30, 2014 Mortgage Servicing Rights [Member] | Sep. 30, 2014 Senior Secured Notes [Member] | Apr. 12, 2011 Senior Secured Notes [Member] | Sep. 30, 2014 Auction Rate Securities [Member] Maximum [Member] | Sep. 30, 2014 Fair Value, Valuation Scenario Two [Member] Auction Rate Securities [Member] | Sep. 30, 2014 Fair Value, Valuation Scenario One [Member] Auction Rate Securities [Member] | Sep. 30, 2014 Auction Rate Securities Purchase Commitment [Member] | Sep. 30, 2014 Auction Rate Securities Purchase Commitment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the corporate equities that are included in securities owned |  |  |  | $ 15,400,000 | $ 15,300,000 |  |  |  |  |  |  |  |
Permanent and construction loans , discount rate |  |  |  |  |  | 12.00% |  |  |  |  |  |  |
Continuous prepayment rate used up to loans prepayment penalty rate hit 4% |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Continuous prepayment rate |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Continuous prepayment rate vast majority range minimum |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Continuous prepayment rate vast majority range maximum |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Continuous prepayment rate vast majority range average rate |  |  |  |  |  | 12.00% |  |  |  |  |  |  |
Estimated future cost to service loans on an annual basis per loan, average |  |  |  |  |  | 1,250 |  |  |  |  |  |  |
Company purchased and holds auction rate securities | 94,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase ARS from clients through 2016 | 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase ARS period maximum |  |  |  |  |  |  |  |  | 2016 |  |  |  |
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate |  |  |  |  |  |  |  |  |  | 0.50% | 0.25% |  |
Decrease in fair value of ARS |  |  |  |  |  |  |  |  |  | 1,800,000 | 910,000 |  |
Valuation adjustment (unrealized loss) for ARS | 8,514,000 |  | 7,477,000 |  |  |  |  |  |  |  |  | 1,037,000 | 1,000,000
Interest rate |  |  |  |  |  |  | 8.75% | 8.75% |  |  |  |  |
Fair value of the reverse repurchase agreements | 250,000,000 | 184,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of repurchase agreements |  | 0 |  |  |  |  |  |  |  |  |  |  |
Loans held for sale period | 60 days |  |  |  |  |  |  |  |  |  |  |  |
Fair value of loan held for sale | 20,095,000 | 75,989,000 |  |  |  |  |  |  |  |  |  |  |
Book value of loan held for sale | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |  |  |  |  |  |  |  |  |  |  |

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