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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 ForwardContracts | Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction rate securities valuation adjustment | $ 8,700,000 |
Loan position held in secondary loan trading portfolio | 0 | 0
Loans held for sale period | 60 days |
Fair value of loan held for sale | 9,438,000 | 75,989,000
Book value of loan held for sale | 9,700,000 |
Number of foreign exchange option outstanding | 0 |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Deferred Compensation [Member] | Corporate Equities Liabilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of the corporate equities that are included in securities owned | 15,100,000 | 15,300,000
U.S. Treasury Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of open short contract | 330 |
Open short contract, period | 10 years |
Futures contracts used as economic hedge | 179,000 |
Federal Funds Futures [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Futures contracts used as economic hedge | 105,000 |
Open contracts for Federal Funds futures | 1,125 |
Mortgage Servicing Rights [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
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 maximum | 15.00% |
Continuous prepayment rate vast majority range minimum | 10.00% |
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 |
Senior Secured Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate | 8.75% |
Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Company purchased and holds auction rate securities | 91,500,000 |
Commitment to purchase ARS from clients through 2016 | 5,000,000 |
ARS held in proprietary trading account result of the failed auctions |  |
Assets and liabilities transferred from level one and level two | 0 |
Auction Rate Securities [Member] | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitment to purchase ARS period maximum | 2016 |
Auction Rate Securities [Member] | Range One [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 0.25% |
Decrease in fair value of ARS | 1,000,000 |
Auction Rate Securities [Member] | Range Two [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Basis point | 0.50% |
Decrease in fair value of ARS | 2,100,000 |
Auction Rate Securities Owned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Valuation adjustment (unrealized loss) for ARS | 6,500,000 |
Auction Rate Securities Commitments to Purchase [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction rate securities valuation adjustment | $ 2,200,000 |

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