Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Held to maturity	$ 306,827	$ 406,884
Available for sale	107,050	90,322
Total	413,877	497,206
Held to maturity, short-term investments	306,827	406,884
Available for sale, short-term investments	3,371	1,200
Total, short-term investments	310,198	408,084
Available for sale, long-term investments	103,679	89,122
Total, long-term investments	103,679	89,122
Certificates of deposit, commercial paper and money market funds
Investment Holdings [Line Items]
Held to maturity	256,827	406,884
Total	256,827	406,884
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	50,000
Available for sale, equity securities	47,404	33,482
Total	97,404	33,482
Cash surrender value of life insurance policies
Investment Holdings [Line Items]
Available for sale, equity securities	59,646	56,840
Total	$ 59,646	$ 56,840

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

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