Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Held to maturity	$ 647,885	$ 406,884
Available for sale	53,259	33,482
Total	701,144	440,366
Held to maturity, short-term investments	647,885	406,884
Available for sale, short-term investments	11,593	1,200
Total, short-term investments	659,478	408,084
Available for sale, long-term investments	41,666	32,282
Total, long-term investments	41,666	32,282
Certificates of deposit, commercial paper and money market funds
Investment Holdings [Line Items]
Held to maturity	647,885	406,884
Total	647,885	406,884
Investments in mutual funds, debt securities and common stock
Investment Holdings [Line Items]
Available for sale, equity securities	53,259	33,482
Total	$ 53,259	$ 33,482

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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