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Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 ForwardContracts | Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loan position held in secondary loan trading portfolio | $ 0 | $ 0
Fair value of the reverse repurchase agreements | 184,000,000 |
Fair value of the repurchase agreements | 0 |
Loans held for sale period | 60 days |
Fair value of loan held for sale | 75,989,000 |
Book value of loan held for sale | 74,200,000 |
Derivatives instruments gain recognized income |  | 28,000
Number of foreign exchange option outstanding | 0 |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction rate securities valuation adjustment | 9,100,000 |
Auction Rate Securities Owned other [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction rate securities valuation adjustment | 6,500,000 |
ARS Purchase Commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction rate securities valuation adjustment | 2,600,000 |
Deferred Compensation Share Based Payments [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 | 15,300,000 | 14,000,000
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 | 91,600,000 |
Commitment to purchase ARS from clients through 2016 | 29,100,000 |
ARS held in proprietary trading account result of the failed auctions | 150,000 |
Valuation adjustment (unrealized loss) for ARS | 6,500,000 |
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 | 1,900,000 |
Decrease in fair value of ARS correspond to reduction in duration | 1,900,000 |
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 | 3,800,000 |
Decrease in fair value of ARS correspond to reduction in duration | 2,000,000 |
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 |
U.S. Treasury Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of open short contract | 400 |
Open short contract, period | 10 years |
Futures contracts used as economic hedge | 186,000 |
Federal Funds Futures [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Futures contracts used as economic hedge | $ 18,000 |
Open contracts for Federal Funds futures | 1,231 |

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