Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Held to maturity	$ 382,399	$ 406,884
Available for sale	48,667	33,482
Total	431,066	440,366
Held to maturity, short-term investments	382,399	406,884
Available for sale, short-term investments	14,069	1,200
Total, short-term investments	396,468	408,084
Available for sale, long-term investments	34,598	32,282
Total, long-term investments	34,598	32,282
Certificates of deposit, commercial paper and money market funds
Investment Holdings [Line Items]
Held to maturity	382,399	406,884
Total	382,399	406,884
Investments in mutual funds, debt securities and common stock
Investment Holdings [Line Items]
Available for sale, equity securities	48,667	33,482
Total	$ 48,667	$ 33,482

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

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