Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial Assets:
Limited partnership investments	$ 28,226	$ 23,930
ADC Arrangement classified as real estate investment		10,200
Financial Liabilities:
Total long-term debt	138,172	129,429
Senior Notes [Member]
Financial Liabilities:
Total long-term debt	39,392	39,231
Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	81,170	90,198
4% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,771
3.75% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,839
Portion at Other than Fair Value Measurement [Member]
Financial Assets:
Limited partnership investments	28,226	23,930
ADC Arrangement classified as real estate investment		10,140
Financial Liabilities:
Total long-term debt	144,075	133,885
Portion at Other than Fair Value Measurement [Member] \| Senior Notes [Member]
Financial Liabilities:
Total long-term debt	41,989	41,103
Portion at Other than Fair Value Measurement [Member] \| Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	84,561	92,782
Portion at Other than Fair Value Measurement [Member] \| 4% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,854
Portion at Other than Fair Value Measurement [Member] \| 3.75% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,671
Portion at Other than Fair Value Measurement [Member] \| (Level 2) [Member]
Financial Liabilities:
Total long-term debt	41,989	41,103
Portion at Other than Fair Value Measurement [Member] \| (Level 2) [Member] \| Senior Notes [Member]
Financial Liabilities:
Total long-term debt	41,989	41,103
Portion at Other than Fair Value Measurement [Member] \| (Level 3) [Member]
Financial Assets:
Limited partnership investments	28,226	23,930
ADC Arrangement classified as real estate investment		10,140
Financial Liabilities:
Total long-term debt	102,086	92,782
Portion at Other than Fair Value Measurement [Member] \| (Level 3) [Member] \| Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	84,561	$ 92,782
Portion at Other than Fair Value Measurement [Member] \| (Level 3) [Member] \| 4% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,854
Portion at Other than Fair Value Measurement [Member] \| (Level 3) [Member] \| 3.75% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	$ 8,671

Disclosure Carrying Value of Financial Assets.

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Disclosure fair value of financial assets.

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Financial Liabilities Carrying Value Disclosure [Abstract]

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Represents the holding of limited partnership interests for investment purposes and is accounted for using the equity method.

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Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
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-Publisher FASB
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-Topic 944
-SubTopic 210
-Section S99
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-Topic 310
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-Paragraph 3
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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