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Marketable Investment Securities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Estimated fair value $ 236,357 $ 270,586
Restricted Cash
   
Schedule of Available-for-sale Securities [Line Items]    
Estimated fair value $ 22,674