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Investments - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Apr. 09, 2013 USD ($) | Apr. 09, 2013 EUR (€)
Investment [Line Items] |  |  |  |  |
Realized gain on trading securities | $ 0.4 | $ 8.2 | $ 1.0 |  |
Interest acquired in limited partnership |  | 5.0 |  |  |
Percentage of noncontrolling equity interest acquired | 50.00% |  |  |  |
Maximum [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Future capital commitment |  | $ 4.9 |  |  |
Kleinwort Benson Investors International, Ltd. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Percentage of noncontrolling equity interest acquired |  |  |  | 24.00% | 24.00%
Noncontrolling equity interest acquired, amount |  |  |  | $ 3.4 | € 2.6

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- Definition Amount of gain (loss) realized from securities classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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