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Investments - Summary of Amounts Included in Restricted Investments and Unrestricted Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 105,340	$ 139,227
Gross Unrealized Gains	66	26
Gross Unrealized (Losses)	(104)	(284)
Estimated Fair Value	105,302	138,969
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	49,421	83,507
Gross Unrealized Gains	66	26
Gross Unrealized (Losses)	(47)	(169)
Estimated Fair Value	49,440	83,364
Municipal Bond Mutual Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	55,919	55,720
Gross Unrealized (Losses)	(57)	(115)
Estimated Fair Value	$ 55,862	$ 55,605

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.

+ References

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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-Section S99
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-Publisher FASB
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-Section S99
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