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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Short-term, Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	$ 1,078
Total short-term investments (available for sale), Gross Unrealized Gain	3
Total short-term investments (available for sale), Fair value	1,081
Short-term, Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	212,120	$ 179,393
Total short-term investments (available for sale), Gross Unrealized Gain	490	35
Total short-term investments (available for sale), Gross Unrealized (Loss)	(54)	(337)
Total short-term investments (available for sale), Fair value	212,556	179,091
Short-term, Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	20,788	17,417
Total short-term investments (available for sale), Gross Unrealized Gain	4	5
Total short-term investments (available for sale), Gross Unrealized (Loss)	(14)	(85)
Total short-term investments (available for sale), Fair value	20,778	17,337
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	233,986	196,810
Total short-term investments (available for sale), Gross Unrealized Gain	497	40
Total short-term investments (available for sale), Gross Unrealized (Loss)	(68)	(422)
Total short-term investments (available for sale), Fair value	$ 234,415	$ 196,428

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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