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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 |

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 + Details
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- Definition 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. + References 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 + Details
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