Investments - Investments from Continuing Operations (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 128,073	$ 131,058
Total investments (available for sale), Gross Unrealized Gain	27	8
Total investments (available for sale), Gross Unrealized (Loss)	(700)	(834)
Total investments (available for sale), Fair value	127,400	130,232
Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	12,486	14,199
Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	92,002	98,130
Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	22,912	17,903
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	120,223	123,208
Total investments (available for sale), Gross Unrealized Gain	27	8
Total investments (available for sale), Gross Unrealized (Loss)	(224)	(358)
Total investments (available for sale), Fair value	120,026	122,858
Short-term Investments [Member] \| Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	5,158	6,880
Total investments (available for sale), Gross Unrealized Gain	1	1
Total investments (available for sale), Gross Unrealized (Loss)	(47)	(56)
Total investments (available for sale), Fair value	5,112	6,825
Short-term Investments [Member] \| Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	92,152	98,400
Total investments (available for sale), Gross Unrealized Gain	12	1
Total investments (available for sale), Gross Unrealized (Loss)	(162)	(271)
Total investments (available for sale), Fair value	92,002	98,130
Short-term Investments [Member] \| Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	22,913	17,928
Total investments (available for sale), Gross Unrealized Gain	14	6
Total investments (available for sale), Gross Unrealized (Loss)	(15)	(31)
Total investments (available for sale), Fair value	22,912	17,903
Long Term Investments [Member] \| Municipal Bond [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

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

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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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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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