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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
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