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, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Amortized Cost	$ 139,534	$ 197,945	$ 74,266	$ 91,060
Fair Value	139,534	197,945
Investments [Abstract]
Amortized Cost	207,969	233,730
Gross Unrealized Gains	2	8
Gross Unrealized Losses	(107)	(76)
Fair Value	207,864	233,662
Cash and money market accounts
Cash and Cash Equivalents [Abstract]
Amortized Cost	133,535	196,445
Fair Value	133,535	196,445
Commercial paper
Cash and Cash Equivalents [Abstract]
Amortized Cost	5,999	1,500
Fair Value	5,999	1,500
Commercial paper
Investments [Abstract]
Amortized Cost	27,285
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	27,285
Certificates of deposit (due within 1 year)
Investments [Abstract]
Amortized Cost	3,800	6,920
Gross Unrealized Gains	1	4
Gross Unrealized Losses	(1)	(1)
Fair Value	3,800	6,923
Corporate bonds (due within 1 year)
Investments [Abstract]
Amortized Cost	37,350	27,615
Gross Unrealized Gains	1	4
Gross Unrealized Losses	(106)	(75)
Fair Value	37,245	27,544
Government agencies
Investments [Abstract]
Amortized Cost		1,250
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		1,250
Total investments
Investments [Abstract]
Amortized Cost	68,435	35,785
Gross Unrealized Gains	2	8
Gross Unrealized Losses	(107)	(76)
Fair Value	$ 68,330	$ 35,717