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Investments - Summary of Amounts Included in Investments (Detail) (Municipal securities [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Municipal securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost $ 23,810
Gross Unrealized Gains 1
Gross Unrealized (Losses) (9)
Estimated Fair Value $ 23,802