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Investments - Summary of Amounts Included in Restricted Investments and Unrestricted Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 139,191	$ 168,750
Gross Unrealized Gains	41	51
Gross Unrealized (Losses)	(339)	(177)
Estimated Fair Value	138,893	168,624
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	83,658	83,364
Gross Unrealized Gains	41	51
Gross Unrealized (Losses)	(166)	(177)
Estimated Fair Value	83,533	83,238
Municipal Bond Mutual Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	55,533	85,386
Gross Unrealized (Losses)	(173)
Estimated Fair Value	$ 55,360	$ 85,386

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (b)



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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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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



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