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Investments - Additional Information (Detail)
9 Months Ended
Sep. 30, 2015
USD ($)
Available-for-sale Securities [Abstract]  
Available for sale, gross unrealized term held 12 months
Other-than-temporary impairments considered $ 0
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 20.00%
Other Investment Not Readily Marketable, Fair Value $ 10,000,000