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Equity Method Investment in Affiliate - Additional Information (Detail) |  |  | 1 Months Ended
--- | --- | --- | ---
Sep. 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 |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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