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Investments - Investments from Continuing Operations (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 156,432	$ 123,128
Total investments (available for sale), Gross Unrealized Gain	32	3
Total investments (available for sale), Gross Unrealized (Loss)	(186)	(856)
Total investments (available for sale), Fair value	156,278	122,275
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	147,835	115,278
Total investments (available for sale), Gross Unrealized Gain	32	3
Total investments (available for sale), Gross Unrealized (Loss)	(186)	(380)
Total investments (available for sale), Fair value	147,681	114,901
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	4,050	1,500
Total investments (available for sale), Gross Unrealized (Loss)		(11)
Total investments (available for sale), Fair value	4,050	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	107,305	76,999
Total investments (available for sale), Gross Unrealized Gain	22
Total investments (available for sale), Gross Unrealized (Loss)	(113)	(242)
Total investments (available for sale), Fair value	107,214	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	36,480	36,779
Total investments (available for sale), Gross Unrealized Gain	10	3
Total investments (available for sale), Gross Unrealized (Loss)	(73)	(127)
Total investments (available for sale), Fair value	36,417	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	8,597
Total investments (available for sale), Fair value	$ 8,597
Long Term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost		7,850
Total investments (available for sale), Gross Unrealized (Loss)		(476)
Total investments (available for sale), Fair value		$ 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
-Subparagraph (b)
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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
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

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