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Investments - Additional Information (Detail) | 12 Months Ended |  | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] USD ($) | Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] EUR (€)
Investment [Line Items] |  |  |  |  |  |
Realized gain (loss) on trading securities | $ 1,000,000 | $ 400,000 | $ (100,000) |  |  |
Acquisition date |  |  |  |  | Apr. 09, 2013 | Apr. 09, 2013
Percentage of noncontrolling equity interest acquired | 50.00% |  |  |  | 24.00% | 24.00%
Noncontrolling equity interest acquired, amount |  |  |  |  | 3,400,000 | 2,600,000
Investment to goodwill | 5,260,000 | 5,260,000 | 4,795,000 | 4,795,000 | 2,500,000 |
Definite-lived intangible assets |  |  |  |  | 600,000 |
Period of amortization of definite-lived intangible assets |  |  |  |  | 7 years | 7 years
Remaining assets and liabilities |  |  |  |  | $ 300,000 |

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