Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held to maturity	$ 312,065	$ 306,827
Available for sale	109,568	107,050
Total	421,633	413,877
Held to maturity, short-term investments	312,065	306,827
Available for sale, short-term investments	1,200	3,371
Total, short-term investments	313,265	310,198
Held to maturity, long-term investments	0	0
Available for sale, long-term investments	108,368	103,679
Total, long-term investments	108,368	103,679
Certificates of deposit, commercial paper and money market funds due within one year
Investment Holdings [Line Items]
Held to maturity	312,065	256,827
Total	312,065	256,827
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	50,000
Available for sale, equity securities	48,124	47,404
Total	48,124	97,404
Cash surrender value of life insurance policies
Investment Holdings [Line Items]
Held to maturity	0	0
Available for sale, equity securities	61,444	59,646
Total	$ 61,444	$ 59,646

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

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