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Summary of Proceeds and Realized Gains/(Losses) on Equity Securities and Certificates of Deposit (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments Debt And Equity Securities [Abstract]      
Proceeds $ 15,662 $ 10,654 $ 12,950
Gross Realized Gains    13 124
Gross Realized Losses