Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Held to maturity	$ 406,884	$ 335,975
Available for sale	33,482	28,123
Total	440,366	364,098
Held to maturity, short-term investments	406,884	335,975
Available for sale, short-term investments	1,200	1,424
Total, short-term investments	408,084	337,399
Available for sale, long-term investments	32,282	26,699
Total, long-term investments	32,282	26,699
Certificates of deposit, commercial paper and money market funds
Investment Holdings [Line Items]
Held to maturity	406,884	335,975
Total	406,884	335,975
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Available for sale, equity securities	33,482	28,123
Total	$ 33,482	$ 28,123

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

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