Investments - Summary of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 124,756	$ 131,058
Total investments (available for sale), Gross Unrealized Gain	32	8
Total investments (available for sale), Gross Unrealized (Loss)	(624)	(834)
Total investments (available for sale), Fair value	124,164	130,232
Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	10,142	14,199
Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	86,828	98,130
Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	27,194	17,903
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	116,906	123,208
Total investments (available for sale), Gross Unrealized Gain	32	8
Total investments (available for sale), Gross Unrealized (Loss)	(148)	(358)
Total investments (available for sale), Fair value	116,790	122,858
Short-term Investments [Member] \| Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	2,795	6,880
Total investments (available for sale), Gross Unrealized Gain		1
Total investments (available for sale), Gross Unrealized (Loss)	(27)	(56)
Total investments (available for sale), Fair value	2,768	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	86,932	98,400
Total investments (available for sale), Gross Unrealized Gain	11	1
Total investments (available for sale), Gross Unrealized (Loss)	(115)	(271)
Total investments (available for sale), Fair value	86,828	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	27,179	17,928
Total investments (available for sale), Gross Unrealized Gain	21	6
Total investments (available for sale), Gross Unrealized (Loss)	(6)	(31)
Total investments (available for sale), Fair value	27,194	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

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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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