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Related Party Transactions - Schedule of Related Party Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment Management And Other Fees And Related Party Transactions [Line Items]      
Sub-advisory investment management fees $ 2,089 $ 2,919 $ 4,039
Distribution and administration expenses 6 124 583
Total fees and expenses related to Harris $ 2,095 $ 3,043 $ 4,622