Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held to maturity	$ 210,236	$ 306,827
Available for sale	115,893	107,050
Total	326,129	413,877
Held to maturity, short-term investments	210,236	306,827
Available for sale, short-term investments	1,200	3,371
Total, short-term investments	211,436	310,198
Held to maturity, long-term investments	0	0
Available for sale, long-term investments	114,693	103,679
Total, long-term investments	114,693	103,679
Certificates of deposit, commercial paper and money market funds due within one year
Investment Holdings [Line Items]
Held to maturity	210,236	256,827
Total	210,236	256,827
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	50,000
Available for sale, equity securities	53,209	47,404
Total	53,209	97,404
Cash surrender value of life insurance policies
Investment Holdings [Line Items]
Held to maturity	0	0
Available for sale, equity securities	62,684	59,646
Total	$ 62,684	$ 59,646

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

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