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Investments - Additional Information (Detail)	12 Months Ended				0 Months Ended
Investments - Additional Information (Detail)	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