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Related Parties - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Other Assets [Member]
Dec. 31, 2013
Other Assets [Member]
Mar. 31, 2014
Investment Management [Member]
Mar. 31, 2013
Investment Management [Member]
Mar. 31, 2013
Director [Member]
Related Party Transaction [Line Items]          
Revenue from related parties     $ 1,145 $ 2,152 $ 10,750
Employee compensation arrangement $ 5,699 $ 5,560