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Summary of Short-term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Investments in mutual funds at fair value $ 203,283 $ 149,828
Term deposits with banks 367,589 340,349
Fixed Maturity Plans (FMPs) of mutual funds, at cost 16,354  
Total $ 587,226 $ 490,177