Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Held to maturity	$ 940,589	$ 335,975
Available for sale	31,238	28,123
Total	971,827	364,098
Held to maturity, short-term investments	940,589	335,975
Available for sale, short-term investments	1,552	1,424
Total, short-term investments	942,141	337,399
Available for sale, long-term investments	29,686	26,699
Total, long-term investments	29,686	26,699
Certificates of deposit and money market funds
Investment Holdings [Line Items]
Held to maturity	940,589	335,975
Total	940,589	335,975
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Available for sale, equity securities	31,238	28,123
Total	$ 31,238	$ 28,123

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

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