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Short-Term Investments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Schedule of Investments [Abstract]
Short-term investments' maturity period	1 year

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. The maturity period of the investment.

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No definition available.

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