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Financial Instruments - Additional Information (Detail) (USD $) | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Auction Rate Securities Owned [Member] | Jun. 30, 2014 Deferred Compensation [Member] Corporate Equities Liabilities [Member] | Dec. 31, 2013 Deferred Compensation [Member] Corporate Equities Liabilities [Member] | Jun. 30, 2014 U.S. Treasury Notes [Member] contract | Jun. 30, 2014 Federal Funds Futures [Member] | Jun. 30, 2014 Mortgage Servicing Rights [Member] | Jun. 30, 2014 Senior Secured Notes [Member] | Apr. 12, 2011 Senior Secured Notes [Member] | Jun. 30, 2014 Auction Rate Securities [Member] | Jun. 30, 2014 Auction Rate Securities [Member] Maximum [Member] | Jun. 30, 2014 Fair Value, Valuation Scenario Two [Member] Auction Rate Securities [Member] | Jun. 30, 2014 Fair Value, Valuation Scenario One [Member] Auction Rate Securities [Member] | Jun. 30, 2014 Auction Rate Securities Purchase Commitment [Member] | Jun. 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 |  |  |  | $ 15,600,000 | $ 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 |  |  |  |  |  |  |  |  |  |  | 99,400,000 |  |  |  |  |
Commitment to purchase ARS from clients through 2016 |  |  |  |  |  |  |  |  |  |  | 20,200,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 1,000,000 |  |
Valuation adjustment (unrealized loss) for ARS | 8,346,000 |  | 6,832,000 |  |  |  |  |  |  |  |  |  |  |  | 1,514,000 | 1,514,000
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 | 15,806,000 | 75,989,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of loan held for sale | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of open short contract |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |
Open short contract, period |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Interest Rate Fair Value Hedge Liability at Fair Value |  |  |  |  |  | 188,000 | 43,000 |  |  |  |  |  |  |  |  |
Futures contracts used as economic hedge |  |  |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |
Open contracts for Federal Funds futures |  |  |  |  |  |  | 839 |  |  |  |  |  |  |  |  |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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