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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 161,596	$ 156,432
Total investments (available for sale), Gross Unrealized Gain	7	32
Total investments (available for sale), Gross Unrealized (Loss)	(355)	(186)
Total investments (available for sale), Fair value	161,248	156,278
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	156,526	147,835
Total investments (available for sale), Gross Unrealized Gain	7	32
Total investments (available for sale), Gross Unrealized (Loss)	(355)	(186)
Total investments (available for sale), Fair value	156,178	147,681
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	830	4,050
Total investments (available for sale), Fair value	830	4,050
Short-term Investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	125,485	107,305
Total investments (available for sale), Gross Unrealized Gain	7	22
Total investments (available for sale), Gross Unrealized (Loss)	(222)	(113)
Total investments (available for sale), Fair value	125,270	107,214
Short-term Investments [Member] | Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	30,211	36,480
Total investments (available for sale), Gross Unrealized Gain		10
Total investments (available for sale), Gross Unrealized (Loss)	(133)	(73)
Total investments (available for sale), Fair value	30,078	36,417
Restricted short-term investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	5,070	8,597
Total investments (available for sale), Fair value	$ 5,070	$ 8,597

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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