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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 28, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Furniture, Fixtures and Equipment [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Furniture, Fixtures and Equipment [Member] | Dec. 31, 2013 Notes Receivable [Member] | Dec. 31, 2013 Securities [Member] | Dec. 31, 2013 Commodities [Member] | Mar. 31, 2012 Below Market Leases [Member] | Dec. 31, 2011 Below Market Leases [Member] | Dec. 31, 2013 Below Market Leases [Member] | Dec. 31, 2013 Trademarks and Trade Name [Member] | Jan. 31, 2008 Customer Relationships [Member] | Dec. 31, 2012 Customer Relationships [Member] | Dec. 31, 2013 Customer Relationships [Member] | Dec. 31, 2012 CIBC World Markets Corp. [Member] | Dec. 31, 2013 CIBC World Markets Corp. [Member] | Dec. 31, 2012 CIBC World Markets Corp. [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company owned OMHHF |  |  |  | 83.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest |  |  |  | $ 5,353,000 | $ 4,261,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase percentage of additional shares of OMHHF | 16.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of additional shares of OMHHF | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of loans held for sale |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of loans held for sale |  |  |  | 74,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of loans held for sale |  |  |  | 75,989,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Loss |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in excess of fair value of assets acquired over cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  | 7,000,000
Reduction of deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000
Reduction of occupancy expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300,000
Contingent consideration payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years
Reversal of fixed assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,000
Reversal of customer relationship intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 630,000 |  | 630,000 |  | 630,000
Trademarks and trades names carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,700,000 |  |  |  |  |  |
Impairment occurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Period of amortization on straight line basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 months |  | 180 months |  |  |  | 180 months |
Amortization of below market lease |  | 3,200,000 | 1,100,000 |  | 3,889,000 | 5,390,000 |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |
Remaining useful life of below market intangible asset and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |
Number of business days for related transactions |  |  |  |  |  |  |  |  |  |  |  | 3 days | 1 day |  |  |  |  |  |  |  |  |  |
Cash equivalents maximum maturity period of highly liquid investments |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  | 40,751,000 | 47,324,000 |  |  |  |  |  | 40,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  | 104,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less accumulated amortization |  |  |  | 54,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  |  |  | 9,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan forgiven over service period |  |  |  |  |  |  | 3 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization on straight-line basis |  |  |  |  |  |  |  | 3 years |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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