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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 158,195	$ 123,128
Total investments (available for sale), Gross Unrealized Gain	116	3
Total investments (available for sale), Gross Unrealized (Loss)	(515)	(856)
Total investments (available for sale), Fair value	157,796	122,275
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	140,735	115,278
Total investments (available for sale), Gross Unrealized Gain	116	3
Total investments (available for sale), Gross Unrealized (Loss)	(39)	(380)
Total investments (available for sale), Fair value	140,812	114,901
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost		1,500
Total investments (available for sale), Gross Unrealized (Loss)		(11)
Total investments (available for sale), Fair value		1,489
Short-term Investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	105,475	76,999
Total investments (available for sale), Gross Unrealized Gain	69
Total investments (available for sale), Gross Unrealized (Loss)	(33)	(242)
Total investments (available for sale), Fair value	105,511	76,757
Short-term Investments [Member] | Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	35,260	36,779
Total investments (available for sale), Gross Unrealized Gain	47	3
Total investments (available for sale), Gross Unrealized (Loss)	(6)	(127)
Total investments (available for sale), Fair value	35,301	36,655
Restricted short-term investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	9,610
Total investments (available for sale), Fair value	9,610
Long Term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	7,850	7,850
Total investments (available for sale), Gross Unrealized (Loss)	(476)	(476)
Total investments (available for sale), Fair value	$ 7,374	$ 7,374

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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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+ 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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