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

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Investments - Summary of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents:
AMORTIZED COST	$ 249,501	$ 197,569	$ 139,534	$ 197,945
FAIR VALUE	249,501	197,569
Investments:
AMORTIZED COST	334,134	249,683
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	(157)	(28)
FAIR VALUE	333,977	249,655
Cash and money market funds
Cash and cash equivalents:
AMORTIZED COST	237,514	197,569
FAIR VALUE	237,514	197,569
Commercial paper
Cash and cash equivalents:
AMORTIZED COST	11,987
FAIR VALUE	11,987
Total investments
Investments:
AMORTIZED COST	84,633	52,114
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	(157)	(28)
FAIR VALUE	84,476	52,086
Commercial paper
Investments:
AMORTIZED COST	44,209	30,883
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	0	0
FAIR VALUE	44,209	30,883
Corporate bonds (due within 1 year)
Investments:
AMORTIZED COST	40,424	21,231
GROSS UNREALIZED GAINS	0	0
GROSS UNREALIZED LOSSES	(157)	(28)
FAIR VALUE	$ 40,267	$ 21,203