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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financial Assets: |  |
Limited partnership investments | $ 22,716 | $ 2,550
ADC Arrangement classified as real estate investment | 6,285 | 2,888
Portion at Other than Fair Value Measurement [Member] |  |
Financial Assets: |  |
Limited partnership investments | 19,987 |
ADC Arrangement classified as real estate investment | 6,204 | 2,835
Financial Liabilities: |  |
Total long-term debt | 134,441 | 136,322
Portion at Other than Fair Value Measurement [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 41,828 | 42,955
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 92,613 | 93,367
Portion at Other than Fair Value Measurement [Member] | (Level 2) [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 41,828 | 42,955
Portion at Other than Fair Value Measurement [Member] | (Level 2) [Member] | Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | 41,828 | 42,955
Portion at Other than Fair Value Measurement [Member] | (Level 3) [Member] |  |
Financial Assets: |  |
Limited partnership investments | 19,987 |
ADC Arrangement classified as real estate investment | 6,204 | 2,835
Financial Liabilities: |  |
Total long-term debt | 92,613 | 93,367
Portion at Other than Fair Value Measurement [Member] | (Level 3) [Member] | Convertible Senior Notes [Member] |  |
Financial Liabilities: |  |
Total long-term debt | $ 92,613 | $ 93,367

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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=49124121&loc=d3e5066-111524 + Details
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