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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 131,918	$ 156,432
Total investments (available for sale), Gross Unrealized Gain	17	32
Total investments (available for sale), Gross Unrealized (Loss)	(136)	(186)
Total investments (available for sale), Fair value	131,799	156,278
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	124,821	147,835
Total investments (available for sale), Gross Unrealized Gain	17	32
Total investments (available for sale), Gross Unrealized (Loss)	(136)	(186)
Total investments (available for sale), Fair value	124,702	147,681
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	1,350	4,050
Total investments (available for sale), Fair value	1,350	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	88,800	107,305
Total investments (available for sale), Gross Unrealized Gain	12	22
Total investments (available for sale), Gross Unrealized (Loss)	(58)	(113)
Total investments (available for sale), Fair value	88,754	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	34,671	36,480
Total investments (available for sale), Gross Unrealized Gain	5	10
Total investments (available for sale), Gross Unrealized (Loss)	(78)	(73)
Total investments (available for sale), Fair value	34,598	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	7,097	8,597
Total investments (available for sale), Fair value	$ 7,097	$ 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
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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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-Topic 320
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+ References

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