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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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Amortized Cost	$ 211,938	$ 91,060	$ 106,946	$ 85,586
Fair Value	211,938	91,060
Investments [Abstract]
Amortized Cost	255,615	150,549
Gross Unrealized Gains	14	1
Gross Unrealized Losses	(27)	(180)
Fair Value	255,602	150,370
Cash and money market accounts
Cash and Cash Equivalents [Abstract]
Amortized Cost	206,708	91,060
Fair Value	206,708	91,060
Certificates of deposit
Cash and Cash Equivalents [Abstract]
Amortized Cost	480
Fair Value	480
Commercial paper
Cash and Cash Equivalents [Abstract]
Amortized Cost	1,499
Fair Value	1,499
Corporate bonds
Cash and Cash Equivalents [Abstract]
Amortized Cost	1,251
Fair Value	1,251
Government agencies
Cash and Cash Equivalents [Abstract]
Amortized Cost	2,000
Fair Value	2,000
Certificates of deposit (due within 1 year)
Investments [Abstract]
Amortized Cost	10,280	13,611
Gross Unrealized Gains	11	1
Gross Unrealized Losses	(1)	(7)
Fair Value	10,290	13,605
Commercial paper
Investments [Abstract]
Amortized Cost	1,500	5,977
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(11)
Fair Value	1,500	5,966
Corporate bonds (due within 1 year)
Investments [Abstract]
Amortized Cost	25,417	24,002
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(26)	(65)
Fair Value	25,392	23,937
Certificates of deposit (due within 2 years)
Investments [Abstract]
Amortized Cost		4,760
Gross Unrealized Gains		0
Gross Unrealized Losses		(10)
Fair Value		4,750
Corporate bonds (due within 2 years)
Investments [Abstract]
Amortized Cost	1,970	9,142
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(84)
Fair Value	1,970	9,058
Government agencies
Investments [Abstract]
Amortized Cost	4,510	1,997
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(3)
Fair Value	4,512	1,994
Total investments
Investments [Abstract]
Amortized Cost	43,677	59,489
Gross Unrealized Gains	14	1
Gross Unrealized Losses	(27)	(180)
Fair Value	$ 43,664	$ 59,310