Equity Method Investment in Affiliate - Additional Information (Detail)			1 Months Ended
Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] USD ($)	Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] EUR (€)
Schedule of Equity Method Investments [Line Items]
Acquisition date			Apr. 09, 2013	Apr. 09, 2013
Percentage of noncontrolling equity interest acquired			24.00%	24.00%
Noncontrolling equity interest acquired, amount			$ 3,400,000	€ 2,600,000
Investment to goodwill	5,260,000	5,260,000	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

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net, Excluding Goodwill and Intangibles

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