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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 163,175	$ 161,596
Total investments (available for sale), Gross Unrealized Gain	6	7
Total investments (available for sale), Gross Unrealized (Loss)	(573)	(355)
Total investments (available for sale), Fair value	162,608	161,248
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	158,605	156,526
Total investments (available for sale), Gross Unrealized Gain	6	7
Total investments (available for sale), Gross Unrealized (Loss)	(573)	(355)
Total investments (available for sale), Fair value	158,038	156,178
Short-term Investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	128,641	125,485
Total investments (available for sale), Gross Unrealized Gain	6	7
Total investments (available for sale), Gross Unrealized (Loss)	(415)	(222)
Total investments (available for sale), Fair value	128,232	125,270
Short-term Investments [Member] | Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	29,964	30,211
Total investments (available for sale), Gross Unrealized (Loss)	(158)	(133)
Total investments (available for sale), Fair value	29,806	30,078
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost		830
Total investments (available for sale), Fair value		830
Restricted short-term investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	4,570	5,070
Total investments (available for sale), Fair value	$ 4,570	$ 5,070

X

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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)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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