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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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