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Investments - Schedule of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 86,219 $ 25,937
Unrealized Loss (735) (849)
Unrealized Gain 8,465 3,880
Fair Value 93,949 28,968
Sponsored Mutual Funds and Variable Insurance Funds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 75,866 16,079
Unrealized Loss (627) (704)
Unrealized Gain 6,959 2,529
Fair Value 82,198 17,904
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 7,486 7,043
Unrealized Loss 0   
Unrealized Gain 1,424 1,336
Fair Value 8,910 8,379
Sponsored Closed-End Funds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,867 2,815
Unrealized Loss (108) (145)
Unrealized Gain 82 15
Fair Value $ 2,841 $ 2,685