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Summary of significant accounting policies - Additional Information (Detail) (USD $)
 1 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
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
CIBC World Markets Corp. [Member]
Dec. 31, 2012
CIBC World Markets Corp. [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Securities [Member]
Dec. 31, 2012
Commodities [Member]
Dec. 31, 2012
Furniture, fixtures and equipment [Member]
Minimum [Member]
Y
Dec. 31, 2012
Furniture, fixtures and equipment [Member]
Maximum [Member]
Y
Dec. 31, 2012
Trademarks and trade names [Member]
Jan. 31, 2008
Customer relationships [Member]
M
Dec. 31, 2012
Customer relationships [Member]
Dec. 31, 2012
Customer relationships [Member]
Mar. 31, 2012
Below market lease [Member]
Dec. 31, 2011
Below market lease [Member]
Dec. 31, 2012
Below market lease [Member]
Finite-Lived Intangible Assets [Line Items]                                    
Company owned OMHHF   83.67%                                
Non-controlling interest   $ 4,261,000 $ 5,333,000                              
Purchase percentage of additional shares of OMHHF 16.32%                                  
Purchase of additional shares of OMHHF 3,000,000                                  
Senior Secured Credit Note reference rate description   3-Month LIBOR                                
Interest rate cap contract, expiry date   Dec. 31, 2012                                
Reduction in excess of fair value of assets acquired over cost   7,020,000     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                          
Reversal of fixed assets         65,000                          
Intangible assets, amortized   4,900,000                                
Period of amortization on straight line basis   80 months     180 months                         60 months
Trademarks and trades names carrying value                       31,700,000            
Impairment occurred                             0      
The reversal of the customer relationship intangible assets       630,000                   630,000        
Amortization of below market lease                                 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   47,324,000 54,044,000                              
Face value   108,300,000                                
Less accumulated amortization   51,400,000                                
Reserves   9,600,000                                
Loan forgiven over service period           3 years 5 years                      
Depreciation and amortization on straight-line basis                   3 7   180          
Cumulative translation adjustments   $ 415,000