Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Held to maturity	$ 136,158	$ 306,827
Available for sale	121,329	107,050
Total	257,487	413,877
Held to maturity, short-term investments	136,158	306,827
Available for sale, short-term investments	1,200	3,371
Total, short-term investments	137,358	310,198
Held to maturity, long-term investments	0	0
Available for sale, long-term investments	120,129	103,679
Total, long-term investments	120,129	103,679
Certificates of deposit, commercial paper and money market funds due within one year
Investment Holdings [Line Items]
Held to maturity	136,158	256,827
Available for sale, equity securities	0	0
Total	136,158	256,827
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	50,000
Available for sale, equity securities	57,089	47,404
Total	57,089	97,404
Cash surrender value of life insurance policies
Investment Holdings [Line Items]
Held to maturity	0	0
Available for sale, equity securities	64,240	59,646
Total	$ 64,240	$ 59,646

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

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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