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Short Term Investments - Additional Information (Detail) - US Treasury Securities - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Held to maturity securities, amortized cost	$ 226,600,000	$ 198,500,000
Held to maturity securities, carrying value	226,600,000	198,500,000
Held to maturity securities, fair value	226,700,000	198,500,000
Other-than-temporary impairments related to these investments	$ 0	$ 0
Minimum
Investment [Line Items]
Held to maturity securities maturity range	3 months
Maximum
Investment [Line Items]
Held to maturity securities maturity range	1 year

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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